Slipknot is not satanic, but they are said to not believe in God. Although, in an interview Shawn "Clowen" Crahan said that he goes to church very often. It is confusing but I'm pretty sure that they aren't satanic. I am Christian, but Slipknot is my favorite band, and you can kinda tell that they don't believe in God, but they don't believe in Satan either. Hope that helped explain it a little. Try looking at some different websites. They will probably be able to explain it better than I did.