noun
a religious or philosophical belief system based on the figure of Satan, often involving the worship or veneration of Satan
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Satanism is a religious belief system that worships Satan as a deity.
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Some people mistakenly believe that satanism involves sacrificing animals.
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I heard that guy is into satanism, but I think it's just for attention.
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The dark clouds of satanism loomed over the small town, causing fear and suspicion among the residents.