Tag Archives: William Lane Craig

Sean Carroll debates William Lane Craig on cosmology and God’s existence

British Spitfire and German Messerschmitt Me 109 locked in a dogfight
British Spitfire and German Messerschmitt Me 109 locked in a dogfight

Here’s the video of the debate:

Carroll was as good of a speaker as Craig in terms of style. Very easy to listen to, very quick on his feet, very civil. There was no clear winner on style.

It was difficult to assess the truth value of scientific points being made, especially for the layperson. I explained a few of them in my posts earlier this week, but I think laypeople might struggle with them if they are hearing about these things for the first time.

A couple of Craig’s slides: (click for larger images)

Slide 1 of 2:

Dr. Craig slide #1 of 2
Dr. Craig slide #1 of 2

Slide 2 of 2:

Dr. Craig slide #2 of 2
Dr. Craig slide #2 of 2

Quick summary: (this is not complete, because I couldn’t get everything they were saying noted)

Dr. Craig defended two arguments: 1) the kalam cosmological argument and the fine-tuning argument.

Dr. Craig supported the origin of the universe with 1) the expansion of the universe and 2) the second law of thermodynamics.

Dr. Craig said that the BGV theorem supports a beginning for the universe.

Dr. Craig said that the consensus of scientists did not accept Carroll’s naturalistic cosmology, quoting Stephen Hawking in support.

Dr. Craig said that multiverse models fall victim to the Boltzmann brain problem, where we should observe Boltzmann brains coming into existence and then phasing out again far more probably than embodied minds. But we observe embodied minds, and no Boltzmann brains.

Dr. Carroll said that science cannot study metaphysical questions.

Dr. Carroll said that science is about making models that may or may not be consistent with the experimental data.

Dr. Carroll said that the BGV theorem does not support a beginning for the universe.

Dr. Carroll proposed 17 alternative cosmologies, but did not provide a shred of scientific evidence for any of them, the way that Craig did for the standard model.

Dr. Carroll refuted Dr. Craig’s citation of Stephen Hawking, and Craig yielded the point.

Dr. Carroll speculated that science might progress to the point where the fine-tuning can be explained without an intelligent cause, and he gave an example of where that happened (inflation).

Dr. Craig argued that all 17 of the models suggested by Carroll either conflicted with evidence, had serious problems or did require a beginning.

Dr. Craig argued that Carroll’s own model required a beginning.

Dr. Craig argued that Carroll’s own model fell victim to the Boltzmann brain problem.

Dr. Craig argued that Carroll’s own model violated the second law of thermodynamics.

Dr. Craig re-stated his point that the baby universe spawning in Carroll’s model was speculative and incomplete, and cited Christopher Weaver’s work.

Dr. Carroll denied that things that pop into being out of nothing require a transcendent cause.

Dr. Carroll reiterated that science can only make naturalistic models, and that he did not have to answer questions about ultimate causes.

Dr. Carroll showed a photo of Alan Guth expressing his opinion that the universe is “probably” eternal. No evidence was given for this assertion.

Dr. Carroll said that the fine-tuning was not done in an optimal way, because one fine-tuned value was lower than it needed to be, and it should be exactly what it needed to be if God did it.

Dr. Carroll said that a finely-tuned universe is more probably in naturalism than in theism, because God can do anything he wants and doesn’t need a fine-tuned universe.

Dr. Carroll said he would stop defending his model now, and would instead defend Aguirre-Gratton.

Dr. Craig gave three reasons why the universe popping into being out of nothing requires a transcendent cause.

First, he said that nothing cannot cause anything to happen, because nothing is nothing.

Second, he said that if things pop into being out of nothing, then why don’t we see it happening all the time with other things.

Third, he said that we have no reason to dismiss the causal principle, especially when it is the basis of scientific inquiry and has been so fruitful in the progress of science.

Dr. Craig reiterated that baby universes in Carroll’s model would be dominated by Boltzmann brains, and we don’t observe that.

Dr. Craig said that even on the quantum gravity models that Carroll mentioned, there would still be a beginning.

Dr. Carroll said that Craig mustn’t say “popped into being” but instead that “there was a first moment of time”.

Dr. Carroll said that his model does indeed violate the second law of thermodynamics “YES!”.

At this point Carroll stopped talking about the topic of the debate and started expressing personal opinions about religion. It’s funny how often atheists do this in debates.

Dr. Carroll said that most theists don’t believe in God because of cosmology, but because of community and feelings.

Dr. Carroll said that science had learned a lot in the last 2000 years, so theism was false.

Dr. Carroll said that most philosophers don’t think that God exists, so theism was false.

Dr. Carroll said microscopes and telescopes were absent 2000 years ago, so theism was false.

Dr. Carroll said that religion should be about community and feelings, not about what is true.


My conclusion was that Carroll lost because he is just satisfied to throw theories out and not to argue that they are true by citing evidence. Carroll never seemed to be interested in finding out what is true, but instead he just wanted to tell a story that didn’t include God, and assert that by Occam’s Razor, his story was a better explanation. I am not impressed with theoretical speculations, although the layperson might be. I kept waiting for him to respond to Craig’s points about how his model was falsified by experimental evidence and observations, e.g. – the Boltzmann brains or the baby universe generation, and he never cited the evidence I wanted him to cite. Craig did have some evidence for his views, but he could have been stronger in making his case. He could have shown the e-mail from Vilenkin that stated that he had understood the BGV theorem, and was using it correctly, for example.

For me the winning side comes down to evidence. The standard model is the standard model because of scientific evidence. Until that evidence is overturned, then speculative models are of no interest to anyone who is evidence-driven. Speculations are not science. A philosophical presupposition of metaphysical naturalism is not science.

If you want to see a good lecture on scientific evidence related to cosmology, then there is the particle physicist Michael Strauss lecture on cosmology and fine-tuning at Stanford University and his more recent lecture at the University of Texas. Note that Strauss is an experimental physicist, not a theoretical physicist like Carroll.

Here’s another review of the debate by Randy Everist of Possible Worlds blog. He explains the back-and-forth over Boltzmann brains and the BGV theorem in more detail.

William Lane Craig: churches should focus on apologetics to attract more men

Church sucks, that's why men are bored there
Church sucks, that’s why men are bored there

I saw that Triablogue quoted an interesting passage from William Lane Craig’s newsletter.

Here it is:

One overwhelming impression of these engagements is the way in which the intellectual defense of Christian faith attracts men. Both at Texas A&M and again at Miami every single student who got up to ask a question was a guy! I wondered if the girls are just shy. But then I remembered a lengthy clip Jan and I watched of cast members of Downton Abbey doing a Q&A with an audience in New York. Almost every person who came to the microphone at that event was a woman! It wasn’t until late into the evening that a man finally asked a question, which was remarked by all the cast members. Why the difference between that session and the ones I experienced?—simply because the Downton Abbey program is highly relational, which is more appealing to women, whereas my talks were principally intellectually oriented, which is more appealing to men.

Churches have difficulty attracting men, and the church is becoming increasingly feminized. I believe that apologetics is a key to attracting large numbers of men (as well as women) to church and to Christ. By presenting rational arguments and historical evidences for the truth of the Gospel, by appealing to the mind as well as the heart, we can bring a great influx of men into the Kingdom. I’m so pleased that the church in Canada seems to be awakening to this challenge! I’m convinced that we have the opportunity to revolutionize Western Christianity by reclaiming our intellectual heritage.

I could tell you many, many stories of what it was like for me being shut down by churches who were overly sensitive to the desires of women. In college, I and the other male students had every attempt to bring in scholars to lecture or debate shut down by female leadership. Every single week it was prayer walks, testimonies, hymn sings… over and over. Eventually, the more manly Christians just quit going. Later on, I witnessed apologetics being shut down in the church from the top down and from the bottom up, as well.

I remember one week an excited male friend invited me to his church because his male pastor was giving sermons using Hugh Ross and Gerald Shroeder books. He was trying to tie in the existence of God to cosmology. Well, I showed up the next Sunday to hear, and was disappointed. I could tell that the pastor wanted to go back to that subject, but he never really did. Later on, we found out that a female parishioner had complained that too much science and evidence had ruined her experience of feeling good and being comforted.

I could go on and on and on telling stories like this. To this day, I cannot stand being in a church unless that church has organized things like apologetic training classes, public lectures, public debates or public conferences. But that’s the minority of churches. The fact is that churches are attended far more by women than by men, and pastors are catering to women more than men. Not only will apologetics not be mentioned, but elements of feminism will creep into doctrine (egalitarianism) and all political issues will be avoided. Church has become a place to have good feelings, and it is far divorced from anything like evidence or politics which might be viewed as judgmental and divisive. And yet those are the things that men like to talk about most: right and wrong, public policy, evidential apologetics.

William Lane Craig lectures on the evidence for the resurrection of Jesus

Sherlock Holmes and John Watson: let's take a look at the facts
Sherlock Holmes and John Watson: let’s take a look at the facts

Here is Dr. William Lane Craig giving a long-form argument for the historical event of the resurrection of Jesus, and taking questions from the audience.

The speaker introduction goes for 6 minutes, then Dr. Craig speaks for 35 minutes, then it’s a period of questions and answers with the audience. The total length is 93 minutes, so quite a long period of Q&A. The questions in the Q&A period are quite good.


  • Many people who are willing to accept God’s existence are not willing to accept the God of Christianity
  • Christians need to be ready to show that Jesus rose from the dead as a historical event
  • Private faith is fine for individuals, but when dealing with the public you have to have evidence
  • When making the case, you cannot assume that your audience accepts the Bible as inerrant
  • You must use the New Testament like any other ancient historical document
  • Most historians, Christian and not, accept the basic minimal facts supporting the resurrection of Jesus

Fact #1: the burial of Jesus following his crucifixion

  • Fact #1 is supported by the early creed found in Paul’s first letter to the Corinthians (1 Cor 15)
  • Fact #1 is supported by the early Passion narrative which was a source for Mark’s gospel
  • Fact #1 passes the criterion of enemy attestation, since it praises one of the Sanhedrin
  • Fact #1 is not opposed by any competing burial narratives

Fact #2: on the Sunday following his crucifixion, Jesus’ tomb was found empty by some women

  • Fact #2 is supported by the early Passion narrative which was a source for Mark’s gospel
  • Fact #2 is implied by the early creed found in Paul’s first letter to the Corinthians (1 Cor 15)
  • Fact #2 is simple and lacks legendary embellishment, which argues for an early dating
  • Fact #2 passes the criterion of embarrassment, because it has female, not male, witnesses
  • Fact #2 passes the criterion of enemy attestation, since it is reported by the Jewish leaders

Fact #3: Jesus appeared to various people in various circumstances after his death

  • Fact #3 is supported by the early creed found in Paul’s first letter to the Corinthians (1 Cor 15)
  • Fact #3 is supported by multiple, independent reports of the events from all four gospels
  • Fact #3 explains other historical facts, like the conversion of Jesus’ skeptical brother James

Fact #4: the earliest Christians proclaimed their belief in the resurrection of Jesus

  • Fact #4 explains why the earliest Christians continued to identify Jesus as the Messiah
  • Fact #4 explains why the earliest Christians were suddenly so unconcerned about being killed

Dr. Craig then asks which hypothesis explains all four of these facts. He surveys a number of naturalistic hypotheses, such as the hallucination theory or various conspiracy theories. All of these theories deny one or more of the minimal facts that have been established and accepted by the broad spectrum of historians. In order to reject the resurrection hypothesis, a skeptic would have to deny one of the four facts or propose an explanation that explains those facts better than the resurrection hypothesis.

I listened to the Q&A period while doing housekeeping and I heard lots of good questions. Dr. Craig gives very long answers to the questions. One person asked why we should trust the claim that the Jewish leaders really did say that the disciples stole the body. Another one asked why we should take the resurrection as proof that Jesus was divine. Another asks about the earthquake in Matthew, which Mike Licona and I doubt is intended to be historical, but is more likely to be apocalyptic imagery. Dr. Craig is also asked about the Jewish scholar Geza Vermes, and how many of the minimal facts he accepts. Another questioner asked about the ascension.

You can see this evidence used in an actual debate, against a historian who disagrees with Dr. Craig. That post contains a point by point summary of the debate that I wrote while listening to it.

If you are looking for a good book to read on this topic, the best introductory book on the resurrection is “The Case for the Resurrection of Jesus” and the best comprehensive book is “The Resurrection of Jesus“.

William Lane Craig lectures on naturalistic alternatives to the Big Bang

William Lane Craig lecturing to university students
William Lane Craig lecturing to university students

Here’s the lecture, which was given in 2004 at the University of Colorado, Boulder.

This lecture might be a little advanced for beginners, but if you stretch your mind first, you shouldn’t tear anything. (Note: standard disclaimers apply if you do tear something!)

The description of the video states:

This is quite simply one of the best lectures William Lane Craig (a philosopher of science) has given. Craig explores the origins of the universe. He argues for a beginning of the universe, while refuting scientific models like the Steady State Theory, the Oscillating Theory, Quantum Vacuum Fluctuation Model, Chaotic Inflationary Theory, Quantum Gravity Theory, String Theory, M-Theory and Cyclic Ekpyrotic Theory.

And here is the description of the lecture from Reasonable Faith:

A Templeton Foundation lecture at the University of Colorado, Boulder, laying out the case from contemporary cosmology for the beginning of the universe and its theological implications. Includes a lengthy Q & A period which features previous critics and debate opponents of Dr. Craig who were in attendance, including Michael Tooley, Victor Stenger, and Arnold Guminski.

Craig has previously debated famous atheists Stenger and Tooley previously. And they both asked him questions in the Q&A time of this lecture. Imagine – having laid out your entire case to two people who have debated you before and who know your arguments well. What did they ask Craig, and how did he respond?

The scientific evidence

The Big Bang cosmology that Dr. Craig presents is the standard model for how the universe came into being. It is a theory based on six lines of experimental evidence.

Scientific evidence:

  1. Einstein’s theory of general relativity (GTR)
  2. the red-shifting of light from distant galaxies implies an expanding universe
  3. the cosmic background radiation (which also disproves the oscillating model of the universe)
  4. the second law of thermodynamics applied to star formation theory
  5. hydrogen-helium abundance predictions
  6. radioactive element abundance predictions

It’s probably a good idea to be familiar with these if you are presenting this argument, because experimental science is a reliable way of knowing about reality.

Published research paper

This lecture by Dr. Craig is based on a research paper published in an astrophysics journal, and was delivered to an audience of students and faculty, including atheist physicist Victor Stenger and prominent atheist philosopher Michael Tooley, at the University of Colorado at Boulder.

Here’s the peer-reviewed article that the lecture is based on.

Here’s the abstract:

Both cosmology and philosophy trace their roots to the wonder felt by the ancient Greeks as they contemplated the universe. The ultimate question remains why the universe exists rather than nothing. This question led Leibniz to postulate the existence of a metaphysically necessary being, which he identified as God. Leibniz’s critics, however, disputed this identification, claiming that the space-time universe itself may be the metaphysically necessary being. The discovery during this century that the universe began to exist, however, calls into question the universe’s status as metaphysically necessary, since any necessary being must be eternal in its existence. Although various cosmogonic models claiming to avert the beginning of the universe predicted by the standard model have been and continue to be offered, no model involving an eternal universe has proved as plausible as the standard model. Unless we are to assert that the universe simply sprang into being uncaused out of nothing, we are thus led to Leibniz’s conclusion. Several objections to inferring a supernatural cause of the origin of the universe are considered and found to be unsound.

The whole text of the article is posted online here.

If you want something to post on your Twitter or Facebook that is much shorter than this lecture, then you should check out this quick 4-minute explanation of the kalam argument.

Alexander Vilenkin: “All the evidence we have says that the universe had a beginning”

I’ve decided to explain why physicists believe that there was a creation event in this post. That is to say, I’ve decided to let famous cosmologist Alexander Vilenkin do it.

From Uncommon Descent.


Did the cosmos have a beginning? The Big Bang theory seems to suggest it did, but in recent decades, cosmologists have concocted elaborate theories – for example, an eternally inflating universe or a cyclic universe – which claim to avoid the need for a beginning of the cosmos. Now it appears that the universe really had a beginning after all, even if it wasn’t necessarily the Big Bang.

At a meeting of scientists – titled “State of the Universe” – convened last week at Cambridge University to honor Stephen Hawking’s 70th birthday, cosmologist Alexander Vilenkin of Tufts University in Boston presented evidence that the universe is not eternal after all, leaving scientists at a loss to explain how the cosmos got started without a supernatural creator. The meeting was reported in New Scientist magazine (Why physicists can’t avoid a creation event, 11 January 2012).

[…]In his presentation, Professor Vilenkin discussed three theories which claim to avoid the need for a beginning of the cosmos.

The three theories are chaotic inflationary model, the oscillating model and quantum gravity model. Regular readers will know that those have all been addressed in William Lane Craig’s peer-reviewed paper that evaluates alternatives to the standard Big Bang cosmology.

But let’s see what Vilenkin said.


One popular theory is eternal inflation. Most readers will be familiar with the theory of inflation, which says that the universe increased in volume by a factor of at least 10^78 in its very early stages (from 10^−36 seconds after the Big Bang to sometime between 10^−33 and 10^−32 seconds), before settling into the slower rate of expansion that we see today. The theory of eternal inflation goes further, and holds that the universe is constantly giving birth to smaller “bubble” universes within an ever-expanding multiverse. Each bubble universe undergoes its own initial period of inflation. In some versions of the theory, the bubbles go both backwards and forwards in time, allowing the possibility of an infinite past. Trouble is, the value of one particular cosmic parameter rules out that possibility:

But in 2003, a team including Vilenkin and Guth considered what eternal inflation would mean for the Hubble constant, which describes mathematically the expansion of the universe. They found that the equations didn’t work (Physical Review Letters, DOI: 10.1103/physrevlett.90.151301). “You can’t construct a space-time with this property,” says Vilenkin. It turns out that the constant has a lower limit that prevents inflation in both time directions. “It can’t possibly be eternal in the past,” says Vilenkin. “There must be some kind of boundary.”

A second option explored by Vilenkin was that of a cyclic universe, where the universe goes through an infinite series of big bangs and crunches, with no specific beginning. It was even claimed that a cyclic universe could explain the low observed value of the cosmological constant. But as Vilenkin found, there’s a problem if you look at the disorder in the universe:

Disorder increases with time. So following each cycle, the universe must get more and more disordered. But if there has already been an infinite number of cycles, the universe we inhabit now should be in a state of maximum disorder. Such a universe would be uniformly lukewarm and featureless, and definitely lacking such complicated beings as stars, planets and physicists – nothing like the one we see around us.

One way around that is to propose that the universe just gets bigger with every cycle. Then the amount of disorder per volume doesn’t increase, so needn’t reach the maximum. But Vilenkin found that this scenario falls prey to the same mathematical argument as eternal inflation: if your universe keeps getting bigger, it must have started somewhere.

However, Vilenkin’s options were not exhausted yet. There was another possibility: that the universe had sprung from an eternal cosmic egg:

Vilenkin’s final strike is an attack on a third, lesser-known proposal that the cosmos existed eternally in a static state called the cosmic egg. This finally “cracked” to create the big bang, leading to the expanding universe we see today. Late last year Vilenkin and graduate student Audrey Mithani showed that the egg could not have existed forever after all, as quantum instabilities would force it to collapse after a finite amount of time (arxiv.org/abs/1110.4096). If it cracked instead, leading to the big bang, then this must have happened before it collapsed – and therefore also after a finite amount of time.

“This is also not a good candidate for a beginningless universe,” Vilenkin concludes.

So at the end of the day, what is Vilenkin’s verdict?

“All the evidence we have says that the universe had a beginning.”

This is consistent with the Borde-Guth-Vilenkin Theorem, which I blogged about before, and which William Lane Craig leveraged to his advantage in his debate with Peter Millican.

The Borde-Guth-Vilenkin (BGV) proof shows that every universe that expands must have a space-time boundary in the past. That means that no expanding universe, no matter what the model, can be eternal into the past. No one denies the expansion of space in our universe, and so we are left with a cosmic beginning. Even speculative alternative cosmologies do not escape the need for a beginning.


If the universe came into being out of nothing, which seems to be the case from science, then the universe has a cause. Things do not pop into being, uncaused, out of nothing. The cause of the universe must be transcendent and supernatural. It must be uncaused, because there cannot be an infinite regress of causes. It must be eternal, because it created time. It must be non-physical, because it created space. There are only two possibilities for such a cause. It could be an abstract object or an agent. Abstract objects cannot cause effects. Therefore, the cause is an agent.

Now, let’s have a discussion about this science in our churches, and see if we can’t train Christians to engage with non-Christians about the evidence so that everyone accepts what science tells us about the origin of the universe.