TLDR, they believe their God, Lucifer, is the one true God and Christianity which takes bread and wine as the body and blood to be a perversion. Obviously IDK how prevalent the actual practice is, but Hollywood loonies larp cannibalism quite often and also there's the adrenochrome thing which others have mentioned.
Short answer, yes.
Long answer
TLDR, they believe their God, Lucifer, is the one true God and Christianity which takes bread and wine as the body and blood to be a perversion. Obviously IDK how prevalent the actual practice is, but Hollywood loonies larp cannibalism quite often and also there's the adrenochrome thing which others have mentioned.