I would feel I was intruding on something private that was not mine. Also, we were raised that we could not set foot in a Protestant church (everyone not Catholic was a Protestant, so that would cover mosques, synagouges ?? etc.)without the permission of the priest, even for weddings and funerals. We also could nto go to the YMCA without permission and eventually they let us go swimming but we could not do crafts or jump on the trampoline. So I do have a feeling of us and them. I would be quite happy to use their meeting room, basement area, but I would not want to be looking at their altar or main religious space while I heard music, with some exceptions, like vespers at a cathedral or something. Or if it was music of their church, done by them, like gospel music, that would be OK. I don't have any philosophy about it other than that, but I think they should not rent out their actual church space except as a last resort to bring in money, and even then, why not the meeting room they likely have.

The problem iwth schools that I learned in school law classes is that you really open yourself up to trouble if you let in some groups and not the others. You let the cake decorating group use your kitchen and next the neoNazis want to come in and do something and what do you do? It is really a problem, at least in Washington and/or Maine, where I took my classes.