And are you sure migration doesn't bring religion with it? Because there's no way Triunist temples are causing 99% conversion rates across 5-6 regions of low population full of monsters and undead. Plus, I noticed rogue rurals seem to grow quickly in population until they equal the population of their neighbors, then they slow down.
Rogue regions bordering Astrum have had 99 or 98% conversion rates without any temples, shrines or even priests preaching. The good word builds up a momentum of its own after a while...
