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From Wiki

"Satanism" is a term which has been used since the end of the Middle Ages to describe a number of different belief systems in a number of contexts. People claiming to be Satanists, or outsiders claiming to describe Satanism, ascribe a wide variety of beliefs to Satanism. At the same time there is no established, common sense of this word. These range from the obviously fanatiс sects to the groups of people in search of themselves; from the literal deistic worship of a malevolent spiritual being (Theistic Satanism) to the monography of the atheistic philosopher; from a subversive ritual performance stressing the mockery of Christian symbols (most notably the Black Mass) to denying all rituals