Published Sep 25, 2009 at 8:00 PM EDT Updated Mar 13, 2010 at 7:24 PM EST In his controversial bestseller The God Delusion, evolutionary biologist and atheist Richard Dawkins attacked religious belief. He spoke with me about his new work, The Greatest Show on Earth, and his inimitable style. Excerpts: Why were you motivated to write this book? Well, it's about the evidence for evolution. Evolution