Do understand the fact that Slipknot is not at all Satanic or Anti-Christ. The whole 666/demon masks/brutal-stage-antics thingy is just their way of giving the middle-finger to the fucked-up music industry/business. They've always been good, caring people who make good music complete with uplifting song lyrics that have always inspired so many people, of all races, religion whatsoever. But I also have to say, their image have attracted posers and fakers to buy their albums and claim they're fans. These people don't know the first thing about Slipknot, and they go around making up their fantasy stories about the band being nu-metal or Satanic. I believe these fakers have cast a bad, fake image of Slipknot, and it has driven others to think the worst about the band. Ignore these fakers, go out and buy their album, listen to it properly and understand it. It's really, really good. It's Grindcore.
I hate fakers and modern/new-age metal fans, and I've always sat alone in my room, to think of ways on how to get rid of them. Eliminate them. I hate them. Brutally.