Because Hollywood said so.
Sad but true. The few Satanist I am privileged to know have wicked senses of humor and are strong intelligent people. If I were to ever "go atheist" again, I would look into Satanism. I like a lot of their philosophies.
Plus it would make it easier to stalk...er....admire Grim Jack.
green: God forbid you actually LEARN about it instead of believing what people tell you. *gasp*