Here’s a post on Evolution News that explains what theistic evolution is:
Three geologists stand at the foot of Mt. Rushmore. The first geologist says, “This mountain depicts perfectly the faces of four U.S. Presidents, it must be the work of a master sculptor.” The second says, “You are a geologist, you should know that all mountains were created by natural forces, such as volcanoes and plate movements, the details were then sculpted by erosion from water and wind. How could you possibly think this was the work of an intelligent sculptor? Only a person completely ignorant of geophysics could think those faces were designed.”
The third geologist says to himself, “I don’t want to be seen as ignorant, but the faces in this mountain sure do look like they were designed.” So he thinks a moment and says to the second geologist, “Of course you are right, these faces were sculpted by natural forces such as erosion. Only an ignorant person would think they were designed.” Then he turns to the first and says, “But what a magnificent result, there obviously must have been a master sculptor standing by and watching.”
The third geologist is a theistic evolutionist. Someone who thinks that God did nothing detectable by science in the whole history of the universe, but who also loves to talk about their religious experience and what hymns they like to sing in church. Synonyms for this definition of theistic evolution are “supernaturalist naturalism” and “theistic atheism”. I like the latter, myself. Theistic atheism. Atheism at work for my colleagues on Monday, and theism in the church for my pastor on Sundays.
Now if you call yourself a theistic evolutionist, but you think that intelligent design is detectable in nature by non-theists doing ordinary science with ordinary scientific methods, then you are not a theistic evolutionist according to this definition. This post is not describing you.
You can listen to a debate on theistic evolution between Michael Behe and theistic evolutionist Keith Fox right here to decide if theistic evolution is true. A summary is provided for those who prefer to read instead of listen.