That’s because Satanism was really only created to trigger Christians.
If you create a religion based on a character you don’t believe in, that exists in someone else’s religion, then you’re basically trolling them. Am I mad at it? No. But the thing about atheism that is good is that it is not a reaction to theism. When you turn it into a reaction you lose credibility to theists. You trigger them, sure. But mainly trigger them in a way that reinforces their own beliefs because they take your “satanism” literally. They need that whole satanic thing to be true so why help them by using their terminology? That’s why I don’t like it.
As far as orgies go, I’m down for it. But again… triggering Christians who think we don’t have any morals by then attaching “Satan” to orgies just helps them way too much. And it’s hard to make any case of what morality should be when attaching questionable terms to questionable behavior. They are often like children so they can’t figure out that sex can be done in a good way outside of baby-making marriages.