do, especially to believers. In all likelihood, people regularly overestimate the danger that comes from Satan’s power. Animistic and tribal peoples are terrified of evil spirits, convinced that demons often kill people or make them sick. Yet when we study the sick and the dead, we find they were not killed by Satan but by malaria, AIDS, encephalitis, or other natural causes. Strangely, at about the same time we introduce Western medicine to a village, Satan stops killing so many people. This is