To add to that...
Anybody who tells you they're a Satanist, if you ask them their religion, is (to me) kind of a poser. A "Satanist" to me is just an athiest who doesn't bullshit themselves... which, come to think of it, is basically every athiest. "Satanist" to me is just another word for "Athiest", only the person that calls themselves a "Satanist" is saying it to push social buttons.
Look at Marilyn Manson. Aside from the fact that he was
handed the title of Rev. of the Church of Satan, he made an entire career out of being goth, calling his character the Anti-Christ Superstar and ripping up bibles on stage, and I can't recall one time that he ever labeled himself as "Satanist". As a matter of fact I just found this on wiki which is almost verbatim this whole post.
Marilyn Manson is an Atheist, contrary to popular belief. Though he is commonly percieved to be anti-christian, due to his lyrics and stage persona. This perception was only amplified after recieving the title "Reverend" from Anton LeVey(Founder of the Church of Satan and Author of The Satanic Bible). Which, unlike traditional reverends, plays no role in the Church, and is simply a person worthy of reverence by the LeVeyan Satanists, which is much different that a Satanist(Worshippers of Satan or an alternative great evil).
Reading that over... It's almost like I wrote that shit on wiki when I was drunk and forgot about it.
Fuckin' weird.