Mine varies from place to place too!
Also, there are only six gods, but arch-fiends generally have the power of a god.
In the main Kingdom, the King is a half-celestial -- he's got some real strong ties to one god, and his "divine right" is visible to all. In this kingdom, many Nobles are Aasimar... and many are Tieflings. Most nobles support the same church.
In another part, the Oligarchs are all desendants of a particular Fey union. Religion there is smaller and less organized, even if they tend to follow the same pantheon.
In yet another part -- a banking island ruled by a dragon -- the humans in charge are, shockingly, often half-dragons. They are not particularly religious.
So far, the PCs have only seen a small bit of political tension between different faiths. They haven't seen any internal strife... yet.
-- N