Would a monolithic church of a united (tight) pantheon work out about the same? This would be where priests serve the pantheon, not the individual dieties.
In a way. The way I have it is that various deities were recast as saints of the church but only have power because of 'God' and are shown to be subservient. Clerics of the deities may not like that but those who did not convert are seen as primitive and unenlightened.
So they still get spells etc., but their institutions have no temporal power. The true faith is professed by rulers and nobles.
That is why when I learned more about Lion and Dragon I thought it would make this dominance and monolithic power have some teeth. I want the players to know challenging it's powers a real decision point in the game with potentially fatal conflict following.
I also want to make nobility a thing. As in, joe peasant does not mock or defy a noble openly
Without real danger...