Man, what a big jumble of different religions in the southwest. I think that actually works in SA's favor though, because no faith is strong enough to withstand an organized conversion plan, whereas having a strong opposing faith can hinder greatly.
Wouldn't a massive missionary campaign organized by the Church to a specific area of the continent, like the southwest, be pretty interesting? Since SA will not likely ever have the ability (at least for a long time) to actually ever invade a place like the southwest and force their religion, what if they went the peaceful route (shock, I know, it's SA) and just did a massive, RP-heavy missonary campaign sending tons of missionaries to the area to convert Nobles and people alike?
