What's with Madonna and Satan?

I've found that there are tons of hidden, secret songs performed by Madonna out there that are kinda hard to find. But anyway, they go as something like "Love song to Satan", or "Wonderhell", or "A Map to Hell", etc, etc. Than there is this song of "Prophesy" where she mocks the prophesy out of the book of Revelation by John. Anyone else noticed anything? I'm hopping that I'm mistaking, because I like Madonna's music, but if she's pulling everyone's leg for being confused in her religious adventures while she's been all along in the cult of satanism... creepy....