🎀 Wisteria 🎀

If the GM allows players to choose any origin for a full-fledged game, while strictly forcing everyone into a specific city of a specific faction, it means that, in their vision, everything should work smoothly within the game. And someone here mentioned (I think even you), that the narrative implies that the city/country doesn't plan on going out of its way to appease the church.
As for the nuances of roleplaying individual characters, that's up to the players and their characters. In my opinion, for party content, at least, it's assumed that no idiot will run around the base with their tongue hanging out, wielding an axe, and shouting that they're going to liberate everyone. But as experienced players, I think we have enough competence to create adequate characters, regardless of their origin.