Satanism is too often misunderstood as a religion that makes blood sacrifices to an evil, horned Prince of Darkness. In reality, modern Satanists are nonviolent and nontheistic, and consider the Devil to be a meaningful metaphor for the pursuit of knowledge, reason, and justice. The Little Book of Satanism details the 'mark of the beast' in cultural and historic movements over the centuries, which have informed the sincerely held beliefs and practices of Satanists today, and explains how Satanism developed in the context of social history while debunking conspiracy theories about serial killers and ritual abuse.