This book argues that the religious visions and experiences of many religious founders were the result of mental health disorders or neurological conditions, thereby calling into question supernatural origins about the faiths that they developed. Using a multi-disciplinary approach to examine psychobiographies of numerous major and minor religious figures in Judaism, Christianity, and Islam (Ezekiel, Sabbatai Şevi, St. Paul, John Wesley, and Muhammad), along with leaders of many newer or alternative sects and cults (Rajneesh, Charles Manson, L. Ron Hubbard, David Berg, Marshall Applewhite, Jim Jones, Sun Myung Moon, and Elizabeth Clare Prophet).