You have no idea, do you, brocel? Lucifer and demon worship goes back to the days of the old mystery religions from thousands of years ago, well before the Abrahamic religions.
The real satanists are the ones who believe that Lucifer - the light bearer - is their god. They believe that Lucifer wanted to help humanity by encouraging them to seek knowledge from the tree of knowledge (the apple), and they reject God, because they believe God wanted to keep humanity in darkness. They perform ritual human rape and sacrifice - something about the pure energy when the sacrifice is young and innocent, or "untainted" (it's been a while since I've looked into it and studied it; the subject matter is horrific, even from a scholarly perspective). This is what they actually believe and practice. It also happens that many high ranking corporate and political leaders in the world are satanists of this variety. This is the Illuminati and Lucifer is their god.
Laveyan satanism is very modern, cultural phenomenon that tries to codify selfish hedonism and materialism into a religion. This is very far removed from the real deal.