Tag Archives: Logic

Videos

William Lane Craig lectures on naturalistic alternatives to the Big Bang

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Here’s the lecture, which was given in 2004 at the University of Colorado, Boulder. A very liberal university!

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

If you are looking for some detail on these evidences, here’s a re-cap of the three main evidences for the Big Bang cosmology from Caltech. (Numbers 2, 3 and 5 from the list above)

Excerpt:

Until the early 1900s, most people had assumed that the universe was fixed in size. New possibilities opened up in 1915, when Einstein formulated his famous general relativity theory that describes the nature of space, time, and gravity. This theory allows for expansion or contraction of the fabric of space. In 1917, astronomer Willem de Sitter applied this theory to the entire universe and boldly went on to show that the universe could be expanding. Aleksandr Friedmann, a mathematician, reached the same conclusion in a more general way in 1922, as did Georges Lemaître, a cosmologist and a Jesuit, in 1927. This step was revolutionary since the accepted view at the time was that the universe was static in size. Tracing back this expanding universe, Lemaître imagined all matter initially contained in a tiny universe and then exploding. These thoughts introduced amazing new possibilities for the universe, but were independent of observation at that time.

Why Do We Think the Big Bang Happened?

Three main observational results over the past century led astronomers to become certain that the universe began with the big bang. First, they found out that the universe is expanding—meaning that the separations between galaxies are becoming larger and larger. This led them to deduce that everything used to be extremely close together before some kind of explosion. Second, the big bang perfectly explains the abundance of helium and other nuclei like deuterium (an isotope of hydrogen) in the universe. A hot, dense, and expanding environment at the beginning could produce these nuclei in the abundance we observe today. Third, astronomers could actually observe the cosmic background radiation—the afterglow of the explosion—from every direction in the universe. This last evidence so conclusively confirmed the theory of the universe’s beginning that Stephen Hawking said, “It is the discovery of the century, if not of all time.”

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.

Polemics

Is the Bible’s definition of faith opposed to logic and evidence?

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Probably the biggest misconception that I encounter when defending the faith is the mistaken notion of what faith is. Today we are going to get to the bottom of what the Bible says faith is, once and for all. This post will be useful to Christians and atheists, alike.

What is faith according to the Bible?

I am going to reference this article from apologist Greg Koukl of Stand to Reason in my explanation.

Koukl cites three Biblical examples to support the idea that faith is not blind leap-of-faith wishing, but is based on evidence.

  1. Moses went out into the wilderness and he had that first encounter with the burning bush, and God gave him the directive to go back to Egypt and let his people go. Moses said, Yeah, right. What’s going to happen when they say, why should we believe you, Moses?God said, See that staff? Throw it down.Moses threw it down and it turned into a serpent.God said, See that serpent? Pick it up.And he picked it up and it turned back into a staff.God said, Now you take that and do that before the Jewish people and you do that before Pharaoh. And you do this number with the hail, and the frogs, and turning the Nile River into blood. You put the sun out. You do a bunch of other tricks to get their attention.And then comes this phrase: “So that they might know that there is a God in Israel.”
  2. [I]n Mark 2 you see Jesus preaching in a house, and you know the story where they take the roof off and let the paralytic down through the roof. Jesus said, “Your sins are forgiven.” And people get bugged because how can anyone forgive sins but God alone?Jesus understood what they were thinking and He said this: What’s harder to say, your sins are forgiven, or to rise, take up your pallet and go home?Now, I’ll tell you what would be harder for me to say : Arise, take up your pallet and go home. I can walk into any Bible study and say your sins are forgiven and nobody is going to know if I know what I am talking about or not. But if I lay hands on somebody in a wheelchair and I say, Take up your wheelchair and go home, and they sit there, I look pretty dumb because everyone knows nothing happened.But Jesus adds this. He says, “In order that you may know that the Son of Man has the power and authority to forgive sins, I say to you, arise, take up your pallet and go home.” And he got up and he got out. Notice the phrase “In order that you may know”. Same message, right?
  3. Move over to the Book of Acts. First sermon after Pentecost. Peter was up in front of this massive crowd. He was talking about the resurrection to which he was an eyewitness. He talked about fulfilled prophecy. He talked about the miraculous tongues and the miraculous manifestation of being able to speak in a language you don’t know. Do you think this is physical evidence to those people? I think so. Pretty powerful.Peter tells them, These men are not drunk as it seems, but rather this is a fulfillment of prophecy. David spoke of this. Jesus got out of the grave, and we saw him, and we proclaim this to you.Do you know how he ends his sermon? It’s really great. Acts 2:36. I’ve been a Christian 20 years and I didn’t see this until about a year ago. This is for all of those who think that if you can know it for sure, you can’t exercise faith in it. Here is what Peter said. Acts 2:36, “Therefore let all the house of Israel know for certain that God has made him both Lord and Christ, Messiah, this Jesus whom you crucified.” There it is again. “Know for certain.”

What is faith according to Bible-based theologians?

I am going to reference this article from theologian C. Michael Patton of Parchment and Pen in my explanation.

Patton explains that according to Reformation (conservative, Bible-based) theologians, faith has 3 parts:

  1. notitia – This is the basic informational foundation of our faith. It is best expressed by the word content. Faith, according to the Reformers must have content. You cannot have faith in nothing. There must be some referential propositional truth to which the faith points. The proposition “Christ rose from the grave,” for example, is a necessary information base that Christians must have.
  2. assensus – This is the assent or confidence that we have that the notitia is correct… This involves evidence which leads to the conviction of the truthfulness of the proposition… This involves intellectual assent and persuasion based upon critical thought… assensus… says, “I am persuaded to believe that Christ rose from the grave.”
  3. fiducia – This is the “resting” in the information based upon a conviction of its truthfulness. Fiducia is best expressed by the English word “trust.”… Fiducia is the personal subjective act of the will to take the final step. It is important to note that while fiducia goes beyond or transcends the intellect, it is built upon its foundation.

So, Biblical faith is really trust. Trust(3) can only occur after intellectual assent(2), based on evidence and thought. Intellectual assent(2) can only occur after the propositional information(1) is known.

The church today accepts 1 and 3, but denies 2. I call this “fideism” or “blind faith”. Ironically, activist atheists, (the New Atheists), also believe that faith is blind. The postmodern “emergent church” denies 1 and 2. A person could accept 1 and 2 but deny 3 by not re-prioritizing their life based on what they know to be true.

How do beliefs form, according to Christian philosophers?

I am going to reference a portion of chapter 3 of J.P. Moreland’s “Love Your God With All Your Mind” (i.e. – LYGWYM).

J.P. Moreland explains how beliefs form and how you can change them.

  1. Today, people are inclined to think that the sincerity and fervency of one’s beliefs are more important than the content… Nothing could be further from the truth… As far as reality is concerned, what matters is not whether I like a belief or how sincere I am in believing it but whether or not the belief is true. I am responsible for what I believe and, I might add, for what I refuse to believe because the content of what I do or do not believe makes a tremendous difference to what I become and how I act.
  2. A belief’s strength is the degree to which you are convinced the belief is true. As you gain ,evidence and support for a belief, its strength grows for you… The more certain you are of a belief… the more you rely on it as a basis for action.

But the most important point of the article is that your beliefs are not under the control of your will.

…Scripture holds us responsible for our beliefs since it commands us to embrace certain beliefs and warns us of the consequences of accepting other beliefs. On the other hand, experience teaches us that we cannot choose or change our beliefs by direct effort.

For example, if someone offered you $10,000 to believe right now that a pink elephant was sitting next to you, you could not really choose to believe this… If I want to change my beliefs about something, I can embark on a course of study in which I choose to think regularly about certain things, read certain pieces of evidence and argument, and try to find problems with evidence raised against the belief in question.

…by choosing to undertake a course of study… I can put myself in a position to undergo a change in… my beliefs… And… my character and behavior… will be transformed by these belief changes.

I think definition of faith is important, because atheists seemed to want to substitute their own definition of faith as blind belief for this Biblical definition, but there is no evidence for their view that faith is belief without evidence. I think this might be another case of projection by atheists. Blind faith is how they arrive at their views, so they are trying to push it onto us. But the Bible is clearly opposed to it.

Commentary

Does God’s omniscience conflict with human free will?

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Here’s the setup for the question, from Come Reason ministries.

Excerpt:

Hello,

Christian doctrine holds that God is all knowing (1 John 3:20), and humans have free will (Deuteronomy 30:19 is my favorite example). however, at my favorite apologetics debate board, I have seen skeptics raise an objection to these points several times. the basic logic behind their arguments is this:

  1. A being with free will, given two options A and B, can freely choose between A and B.
  2. God is omniscient (all-knowing).
  3. God knows I will choose A.
  4. God cannot be wrong, since an omniscient being cannot have false knowledge.
  5. From 3 and 4, I will choose A and cannot choose B.
  6. From 1 and 5, omniscience and free will cannot co-exist.

I have read many counter-arguments from apologetics sites, but they were either too technical (I couldn’t understand them), or not satisfying. so, I was wondering what would your input be on this issue?

Thank you,

Justin

Ever heard that one? Here’s Lenny Eposito’s answer:

Hi Justin,

Thanks for writing. This is a great question as it shows how even those who appeal to logic can have biases that blind them. Let’s examine this argument and see if it follows logically.

Premises 1 and 2 in your outline above are the main premises to the argument and are not disputed. The Christian worldview argues that every human being is a free moral agent and is capable of making choices simply by exercising their will, not under compulsion or because of instinct. Also, it is a long held doctrine of Christianity that God is all-knowing. The Bible says that God knows “the end from the beginning (Isaiah 46:10).” For omniscience to be truly knowledgeable it must be correct knowledge, so premise number 4 is also granted.

However, point number 5 is where the logic falters. Those who argue in this manner make the mistake of thinking that because God possesses knowledge about a specific matter, then he has influenced it. That does not follow at all. Just because God can foresee which choice you will make, it does not mean you couldn’t still freely choose the other option.

Let me give you an example. I have a five year old son. If I were to leave a chocolate chip cookie on the table about a hour before dinner time and my son was to walk by and see it, I know that he would pick up the cookie and eat it. I did not force him to make that decision. In fact, I don’t even have to be in the room at all. I think I know my son well enough, though, to tell you that if I come back into the kitchen the cookie will be gone. His act was made completely free of my influence, but I knew what his actions would be.

In examining the argument, the assumption is made in premise 3 that because God knows I will choose A somehow denies me the choice of B. That is the premise that Christianity rejects. Omniscience and free will are not incompatible and it is a non-sequitor to claim otherwise.

Thank you Justin for this interesting question. I pray that you will continue to defend the gospel of our Lord and may He continue to bless you as you seek to grow in Him.

That’s a great answer and should work in ordinary conversations.

More technical

J.W. Wartick maps out the arguments more fully with symbolic logic here on his Always Have A Reason blog. But I’ll just excerpt the gist of it.

Excerpt:

It is necessarily true that if God knows x will happen, then x will happen. But then if one takes these terms, God knowing x will happen only means that x will happen, not that x will happen necessarily. Certainly, God’s foreknowledge of an event means that that event will happen, but it does not mean that the event could not have happened otherwise. If an event happens necessarily, that means the event could not have happened otherwise, but God’s foreknowledge of an event doesn’t somehow transfer necessity to the event, it only means that the event will happen. It could have been otherwise, in which case, God’s knowledge would have been different.

[…]Perhaps I could take an example. Let’s say that I’m going to go to classes tomorrow (and I do hope I will, I don’t like missing classes!). God knows in advance that I’m going to go to classes tomorrow. His knowledge of this event means that it will happen, but it doesn’t mean that I couldn’t choose to stay in and sleep for a while, or play my new copy of Final Fantasy XIII, or do something more useless with my time. If I chose to, say, play Final Fantasy XIII (a strong temptation!), then God simply would have known that I would play FFXIII. His knowledge does not determine the outcome, His knowledge is simply of the outcome.

If we choose A, God would foreknow A. If we choose B, God would foreknow B. His foreknowledge of our choices is contingent on our making free choices.

I had to learn symbolic logic and Bayes’ theorem in college for my computers science degrees, and it’s pretty useful for understanding these philosophers. Philosophy is a lot like computer science, at least for analytical philosophy.

UPDATE: Here’s another one from Sam Harper. I would click through just to read his funny author profile.