Satanism

 Of all the religions you could belong to, Satanism is the most illogical. Even Wiccans will agree. 

You're basically taking a religion and doing the opposite of everything in it, instead of getting your own religion. If you really wanted to piss God off, you wouldn't belong to a religion that says that God exists, and what's that line about "the greatest trick Satan ever pulled was convincing people that he doesn't exist"? 

If you really did everything in the satanic religion right, you'd be in jail, because a lot of federal laws are also biblical. Like "do not murder."

A lot of people belonging to Satanism are either rebellious teens, or mild mannered guys like Atticus Murphy Junior on Todd and the Book of Pure Evil.

I've spoken to a wiccan, and he said satanism isn't a serious religion. Since satanism is basically the Bible on opposite day, I tend to agree.