On a winter's evening in 1967, I drove crosstown in San Fransisco to hear Anton Szandor LaVey lecture at an open meeting of the Sexual Freedom League. I was attracted by newspaper articles describing him as "the Black Pope" of a Satanic church in which baptism, wedding, and funeral ceremonies were dedicated to the Devil. I was a free-lance magazine writer, and I felt there might be a story in LaVey and his contemporary pagans; for the Devil has always...