Satanism. Satanism is one of the most controversial belief systems in the world today, in whatever expression it takes. Satan, who not all satanic groups acknowledge or recognize, is presented in the Hebrew and Christian Bible as the chief enemy of God and the most evil being in the universe.erms like âSatanism,â satanic, and even the name Satan, encompass a variety of ideological, philosophical, and spiritual beliefs today. Satanic groups can be quite different from one another, but use the same terminology.