What I haven't seen in an RPG church that happens alot in real life is a... church service! (Mass, if you're Catholic). That would be interesting.
This could be really interesting. You sit through a SHORT sermon(preacher reads a random real/made up proverb), and then everyone has to sing a hymn. Add in a mini game where the player has to match the notes, just using the arrow keys, up, down, left right, and you hit it on time. On success(or partial success) of the mini game you get... buffs, one-time use item, etc. a worthy award atleast. You could easily get sound samples for this using the choir voice effects from a MIDI keyboard. I'd say I could sample them for you, but I don't like to make promises i cant keep. You can download free sound editing programs and virtual MIDI keyboards though and you'll need something called soundfonts. If i were gonna do it I would use a soundfont called Chaos something or other and StudioONE, but there are plenty of other programs. Just google search and I'm sure you can find them yourself. Or keep bugging me enough and I'll make them for you, but I encourage the DIY attitude more. XD
And if you dont think i'm giving you enough information, thats because to find this stuff, the only person I asked was google. You can do it if you want it enough.
That's an interesting idea, but I can see it getting rather tedious.