Not How Satanism Works
There's an actual name for people who worship Satan: Christian heretics. Satan-worshippers are by their natur Christian because they need to acknowledge the existence of the trinity in order to be properly worshipping the opposite on the spectrum.
By definition, heresy is, generally, a doctrine held by a member of a religion at variance with established religious beliefs; more specifically, the veneration and supplication of a/the maleficent deity within a religious framework, while simultaneously acknowledge the deit(y’s)/(ies’) maleficence.
All of that is very vague and generalized, but it is fundamentally correct. Satanists rarely portray themselves as heretics outright from my knowledge and interactions with them.