You were a "troubled teen" You were quick to snap at people you didn't know and you didn't know if you believed in religion or not. So you stuck with Atheism until you find out what you believe in for sure. Of course, that wasn't considered 'Right' to your parents. So, here you are now, stuck in a church as Father Gregor tried to teach you about Christianity.

"So, as the Bible states-" Father Gregor blabbered on, holding an open bible in his hand.