This isn't really a feature request, as I don't have a definite idea behind it and think it's a pretty minor addition. If there's ever an attempt to revive the Religion Game, it may be interesting to pull out.
I also mention it because it could be used for role play right now, if people care to accept the idea in their realm.
Simplest form, a rogue who is a member of a religion, and in a region with a temple of his faith, could ask for sanctuary, with potential consequences if violated. Lots of different mechanics could be used, not going to push for anything too much right now. Leave it there for anyone to run with.
As I said, it could already be role played, so if you're in a good RP realm & the opportunity presents itself, try it out