On the other hand, if you do have these PhD's or would like some good light (light being emphasized very sarcastically here) reading, this is the book for you. Polkinghorne did not mean to prove God's existence through physics or math, just open the minds of those that might never have thought that it is possible to believe in God in an Age of Science.
In all, this may be one of the most important books you'll ever read, if you understand it! I very highly recommend it.