My experience. Sorry, one term at Grammar when some creepy vicar took us for RE (other teachers usually gave this lesson). No, nothing happened. However, I always felt that a few years earlier, in a mixed secondary that permitted classroom CP, this guy would have been like some of the creeps mentioned above. Just a feeling, mind.
Funny, I get most angry reading about kids getting beaten for missing Mass etc., or worse, for disagreeing with the religious teaching of their school. Any religion that needs pain and brainwashing tells me all I need to know about the quality of its values!