...Or ministers, or coaches, or counselors, or nice guy who loves kids whom you trust... Move away from the stereotype. The hell of it is the breach of trust. They could be anyone who has any interaction with kids, even an uncle, father or grandfather. That's why it's such a heinous crime. They walk among us and look just like anyone else.
Religion has nothing to do with it.
Really, how can you tell about anyone? I've known some priests who have been dismissed from the priesthood, and in each case (but one), I was very surprised.