The God Delusion
The God Delusion is a 2006 book by British evolutionary biologist and ethologist Richard Dawkins, in which he argues that a supernatural creator, God, does not exist, and that belief in a personal god qualifies as a delusion, which he defines as a persistent false belief held in the face of strong contradictory evidence. In the book, he expresses his agreement to Robert Pirsig's statement in Lila (1991) that "when one person suffers from a delusion it is called insanity.