Then I highly recommend this one: The Greatest Show on Earth: The Evidence for Evolution by Richard Dawkins.
I'm not one of Dawkins' unquestioning fans. He seems to have become the first evangelical athiest! That doesn't appeal.
But as an utterly absorbing analysis of the processes which shaped our world and life on it, this is a cracking good book.
It's not an easy read. Sometimes it feels like a textbook, or even a lecture. But then, all of a sudden, he'll tell me something utterly fascinating, one of those, "Wow I must remember that", sort of facts.
But if you get a copy for Christmas it's probably best if you don't take it with you to church.