I've witnessed pro drummers using a click but only as reference before the song begins. They get a sense of the tempo then take it upon themselves to carry it through the song. Good players will latch on to that given tempo and help establish it like good band of musicians should!I have been lucky enough not play with tracks in church. On the other hand, I don't have any objection to playing with a click. There are times when we turn the click off on sparse, slow reflective songs so that we have some freedom to change tempo. Over all though, I think a click helps all the musicians, especially the less experienced ones stay together even though they may chafe at it because they bump up against it often. If your church uses all pros, then you may not need the click, but ironically the pros will welcome (maybe even demand) the click in my experience because they recognize what it does for them.
But wearing cans for the entire song with a click in your ear is bordering on abuse!