McGrath wrote the book for those who want more than the classical arguments about the existence of God. Atheists pretend that there are no folks with advanced degrees in science who are theists. The debate is not over knowledge or science. it is over belief. What is believable. A lot of scientists think theism is more believable than atheism. Calling them names or saying they are irrational isn’t a proof the the scientists who are theists are incorrect.