From high school he was an atheist (moment of conversion was when he learned of Stanley Miller's experiment showing that organic compounds can be created by fairly simple physical processes from inorganic substances). But then he married, and five years later his wife became a Christian. He was skeptical, but eventually saw how it transformed her into a good person. He wondered how that could be, and started the path towards his own conversion. I, in turn, wonder if he hadn't already made up his mind at that time?
Everyone he interviews in the movie are creationists (if I write that fast it often comes out as 'cretinist'), so there his journey looking for evidence already looks very biased - something that he makes a point out of not being.
Anyhow, I could go on, but no need. Paul Doland has already dismantled the book for us: The Case for a Creator: A Journalist Investigates Scientific Evidence That Points Toward God (2004). Funny title, by the way. Sounds like he only investigates the scientific evidence that points toward god. Says right there in the title! And that is indeed what he proceeds to do. Doland details:
Prior to the interview on cosmology, Strobel says that he wants to find "hard facts":Doland's rebuttal is very thorough. It goes on like this. If you read Strobel's book or watch the movie, and think he might have a point, I urge you to take a look at the rebuttal before you convert.I wasn't interested in unsupported conjecture or armchair musings by pipe-puffing theorists. I wanted the hard facts of mathematics, the cold data of cosmology, and only the most reasonable inferences that could be drawn from them (p. 95).And in order to obtain the "hard facts of mathematics" and the "cold data of cosmology," Strobel interviewed Dr. Craig, who doesn't even have an undergraduate degree in mathematics or cosmology! Dr. Craig's credentials are purely in theology and philosophy. While Dr. Craig is indeed qualified to publish on related topics, such as the philosophy of science, he is not among the first people one should approach with questions about mathematics and cosmology--unless one already has an underlying agenda.