I've realized I've done at least two things in my life for the simple reason that it would annoy/piss off someone that I didn't like.
First, though maybe this doesn't count since I really did have issues with the faith - I quietly left off being a Christian because I was mad at my family. That doesn't take into account, as I say, the issues I actually had with it but it was a deciding factor in leaving and being an atheist. Then deciding I was going to be a witch - partially because I thought it was better to focus on the Female, yes. But also because I knew it would 'concern' people.
Second, going to a Catholic church.
My mother had just married my Dad and his parents were living with us. His mother hated me and she hated Catholicism. She's an angry ex-Catholic. So, when informed that I *had* to go to a church on Sunday's because no one in the house was *not* going to be Christian, I picked the one I knew would piss her off the most. And proceeded to learn everything I could so I could argue with her about it and be right.
Which, upon reflection would be why neither of these things lasted.