Answer:
Well, nowadays satanism is commonly confused with the New Age movements. Primarily because it's philosophies suggest some "disturbing" realities of our existence. Disturbing for some, exciting for others. The New Age movement is basically this, nothing is natural, everything is supernatural. That the world we see is literally an illusion. That we're not humans with souls, but rather souls inhabiting human bodies temporarily to experience the joys of human life, as well as the sorrows. For example, when you wake up from an intense dream and say to yourself "jeez i'm sure glad that wasn't real." or "whoa.. i'm glad that wasn't actually me". That's the same realization you get once you've died and left your body.
So no, they're not satanic, they're New Age. In fact, all bands that you'd question for being satanic are probably New Age.