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Satanism, just as many others, is a belief. And you may believe anything you wish. But a belief does not necessarily mean it is true!
Most Satanists follow the works of LaVey, an American author who made a lot of money (Millions!) by writing books for the gullible, and founding The Church of Satan.
Many believed him. Many did not!
As the old adage says:-
"You pay your money, and you make your choice."
But most of all, do not state a belief as though it is a fact!