Except it isn't but okay.Only because modern satanism is a made up religion by atheists to try and mock the christian church. If they tried that in the Middle East, they would be burned at the stake, and their "temples" and "scriptures" destroyed.
It literally heavily depends on a lot of things., as there have been multiple instances of it and variations throughout history. They all are generally based around the same principal.
They are also not a major religion and are a small one that can be considered a Pagan religion.