Some people believe sincerity the sole criterion. I’ve just had one of those fraught discussions of church music and you’re always at a disadvantage in trying to argue for some decorum in worship (e.g., people singing close to in tune) when someone responds that Miss Elma Mae Wombat just loves praising the Lord and so what if she does it out of tune and in a screech — God doesn’t care. Only a snob would mind.