i have performed with a longsword team in quite a few churches and the only ptoblem is the churches with tiled floors at the front end make dancing in iron shod clogs both slippy and noisy, the accoustics make the melodeon sound great though.
i have also played ceilidh's in variouis denominations churches but the oddest was the Mormon church who prayed that the band would be good before we started (we were good despite the orange juice only rule)
so Bob the answer is if you don't feel happy with it don't do it
Ken