Quote Originally Posted by Mithras
It's quite a good idea to have some temples of the opposing religion. not only for the perks of said temple but it gives you somewhere to pack family members of the 'wrong' religion to.

The same can be said for Pagan factions-simply use a Christian city as a priest factory.
What, exactly, to priests do? Is whatever bonus they give nearby units worth the bother? I've always disbanded the buggers on sight, and never even considered building new ones. Better to have that 100+ maintenance going towards limetanei, archers, 2-3 peasants, whatever. The monks in the Badon Hill scenario didn't have any effect strong enough for me to notice.

Personally I don't worry too much about the religion of individual governors. If they're good they're almost certainly worth the 5-10% unrest of a religion mismatch, while if they suck they shouldn't be governors at all. Loitering in the province is a good default task for bad governors of a minority religion, I suppose. Though I'm partial to getting them killed off fighting large rebel stacks, myself.