Heh heh, I've known that song since I learned it in the early 70s.

I've heard it done in a church context but I've never played it in church that I recall. I think it's a beautiful song at any rate. A classic in it's own right.
"I know the song, but I'm confused why a Christian church would play a song by a guy who practices Islam."
FWIW: Cat Stevens wrote this one long before he converted to Islam.
Al