Hi all and thanks for all the replies, which I'm embarrassed to say I wasn't aware of all this time!

I never did find out what the problem was, but I think there are some good points there. I was relatively new to the troupe at the time, and I've discovered all their choreographies are 10-15 years old. Yes, they have been presenting exactly the same show for that length of time! So perhaps the age of the song is an issue.

The choreography doesn't reflect the words in any way. Combine that with the idea that it's "not reverential" enough and that could be the issue. It is a Muslim saying after all, and there we are on stage in a bedlah - even if our tummies are covered, our faces and hair aren't and we're showing a lot of cleavage.

It's not an issue any more, though, because I've decided to step away from that school for various reasons - but I think I'll start a new thread for that.