The E-word

I'm currently reading Richard Dawkins' The Greatest Show on Earth. And it's awesome. For those of you who get offended or irritated by Dawkins' attitude towards religion*, fear not! He barely mentions it**.
The book instead is a fascinating, straightforward and entertaining explanation of evolution. And I have to say I'm confused. Not by the evolution thing, but by the people who say they "don't believe in it". Because, well, here:
1. Dog breeders select dogs that carry desired traits to mate a...