I was hoping this book would be factual, but what I found was a bunch of highly biased material.
One inkling of this was when he was trying to explain uncertainty principle, he quoted Deepak Chopra. Chopra has no idea what he's talking about when it comes to the physics and thus never should be consulted.
The other one that solidified it for me was the author's definition of atheism. First, he dedicated two paragraphs to a very complicated subject, which to me showed he really didn't think much of the atheism movement. Second, he quoted an antitheist and C.S. Lewis, neither of whom are particularly good sources for atheism.
My biggest beef about this is, if you cannot be impartial to others' beliefs, don't try to write a factual book about it. Then again, the author's big claim to fame is writing a book for Beliefnet, a website not exactly known for its tolerance.