Some of my characters often base their decisions on the religion of other characters. This includes things like voting, appointments, and even whether or not to help clear a region of monsters. Lord is part of an unfriendly religion? Then I don't vote for him, and let his region burn.
And not just characters that are involved in theocracies, either. This should be a more widespread behavior, especially when the religions involved consider the others as evil. There is an interesting opportunity that is being missed on FEI, too, with Sartan's declaration of MA as evil. It's too bad that so many people ignore it and shrug it off, include the leaders of Sartanism. ("Oh, it's no big deal, don't do anything about it, we're just doing it just because...")
However, I do agree that this request is unlikely to result in anything positive. This is too fine-grained.