I have an idea; mix up the Sagrado areas with Roman Catholic rulers who listen to the Pope in St. Louis. It would make sense, since some would be educated enough to know about what Sagrado Corazon is based on. This would add instability to the region, and an even split would make it an arms race between the Old School Catholics and the cult of saints.
That could just as easily turn into a heresy that simply wishes to establish a Mexican Papacy though, in a similar manner to the Ursulines. Come to think of it, you can actually have a heresy be in a different religious group from its parent, so a Sagrado Corazon heresy that's in the Christian group could actually work.
At one point I made a pull request to add a matriarchal heresy to Sagrado Corazon similar to this (except no cross-group), but for some reason my on_actions didn't work after uploading them.
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