The Catechism Cataclysm(2011)

Father Billy, an eccentric young priest, is forced to take a sabbatical by his superiors when he is discovered telling inappropriate parables to his flock. Billy tracks down his high-school idol Robbie, who begrudgingly agrees to a canoe trip. On the water, the two men reminisce about Billy's days as the keyboardist in a Christian band and Robbie's as a guitarist for a metal band. When night approaches, they realize they have lost their way--and that's when things get weird.