Just to add my 'pennorth: I've toured in America and New Zealand, where concerts in churches are not unusual. The acoustics are out of this world. For myself, I just love looking at churches, taking some unobtrusive photos and contemplating the peace and beauty, and it feels like I'm charging and refreshing my worn-out mental batteries again.

Churches are wonderful works of art wherever in the world they are, especially when you're attending a concert. I'd advise you to unblock your prejudices just a little, free your mind and enjoy!