It is the most popular "version" of Satanism as far as I know.

It is, but telling the OP that he probably doesn't know what Satanism is seems a bit incorrect (assuming that you were referencing the fact that most Satanists don't actually worship Satan), as there are theistic Satanists that exist today. The amount of groups that actually take part in theistic Satanism and other occult practices are very slim, but it does exist. Isn't really a big deal, nor does it really help out the OP, but eh.