BTCPay Server? Build them a node? Parishioners with sats can just scan a QR code to tithe.
I prefer sovereign solutions but there is a platform made for churches to accept BTC (and shitcoin) donations called Engiven.
Would be cool if service was livestreamed so people anywhere could tune in and tithe sats, but that's a whole other can of worms.
@Adam Curry and
@Dave Jones are building GodCaster though to help churches transition to the wonderful BTC-accepting digital world of Podcasting 2.0