Sang in a choir gig in a local Anglican church the other day, mostly backing singer and her band but some of our own songs first. Acoustics were really superb. Could sing into our own sound coming back at us in harmony. As for we basses getting our own voices echoed from the back wall after we'd stopped, it sounded pretty impressive.

Replying to the original poster, some of the choir are less than keen on churches as such - that said, at least one such took part. My impression is that most of us are sensibly relaxed one way or the other - just no point in agonising in either direction.

I can appreciate that one might possibly be a little less relaxed about it were it a more fundamentalist church or in a context where people observed keenly who went where.