"You couldn't believe in God without believing in the Devil. I always tell bands that the most dangerous thing you can do is to believe in the concept of the Devil or the concept of God, because you're not giving them full credit. When you believe in God, you've got to believe in the all-powerful God. He's not just God, He's the all-powerful God and He has total control over everyone's life. The Devil, on the other hand, is a real character that's trying his hardest to tear your life apart. If you believe that this is just mythology, you're a prime target because you know that's exactly what Satan wants: To be a myth. But he's not a myth, of this I'm totally convinced. More than anything in the world, I'm convinced of that."
This is from the linked news article, which involves a lengthy interview with Alice Cooper.