Richard Dawkins, the brilliant evolutionary biologist and author of “The God Delusion” and other bestsellers, reads some of the vitriolic mail sent from fundamentalists who hate him because he’s an outspoken atheist. Each missive is ugly and awful — like most online comments sections — some including death threats. In fact, the tone and verbiage aren’t all that different from the overheated rhetoric we hear from other religious fundamentalists around the world. If these were Muslims, they’d be referred to as extremists, but these are Christians, so they must be filled with love. Right?