Heretic
What Sykotyk said. And if you read the first few books of the Bible, you can easily see how people who don't subscribe to Christianity could look at that as extremely viable. You have a god who kicks people out of the Garden of Eden because they disobeyed his rule and gained knowledge (ie: he wanted to keep 'em ignorant). Moses was the human "hand" of the god for an eternity, but isn't allowed to reach the Promised Land due to one minor transgression. Hell, the god-figure comes off as an utter bastard throughout that whole trip, as about any complaint about anything by anyone on the trek seemed to get him pissed enough to send some sort of punishment down. Maybe that means JJ is the Old Testament god! Uh.....I mean, that makes it easy to make a counterpoint that if Satan's "evil" because he tricked humanity into gaining knowledge, then exactly how is a deity who gets his chuckles from being like, "Dude, to show you love me, sacrifice your son...........hahaha....Abraham, you've been PUNK'D!!!!!" is good? I mean, damn, Job's essentially a story written to tell you that if he wants to win a bet with Satan, God will utterly destroy you and everyone you love if he thinks you'll still be on his side. In the real world, that's the combination of an abusive spouse and the Jigsaw killer!
That's the kind of thing I'd see me getting behind, except since I don't believe in Christianity being any sort of truth, it'd be horribly inconsistent of me to believe in Satanism.
However, when I think "Satanist", I tend to think stupid punks who get off at the thought of hanging in a graveyard at midnight while reciting the works of H.P. Lovecraft and possibly lightly cutting themselves so they can offer some blood to their "dark lord" as part of something they call a "ritual".