Religion on Yaqqothl

You'll never be as badass as this man

DISCLAIMER: If you are particularly sensitive to religious topics, or too stupid not to understand the difference between games and reality, stop reading now, for some of the following sentences may upset you. Being agnostic (insofar as I believe that the problem of the existence of God or other supernatural beings is not only misplaced, but also not worthy of my attention*) I can't be as delicate as the situation would require.

The day before yesterday I had this idea for a monotheistic cult on Yaqqothl. Now I'm going to expand and explain this, as succinctly as I can (yes, probably for the sake of being succinct I shouldn't have used the word succinctly, still it sounds wonderfully weird, as well as wonderfully and weird.)

Problem: D&D Clerics are by definition of the catholic kind, rather than pagans.

Solution A: Use pseudo-catholicism as the main religion. Drawback: You may not want magic-users and clerics to flame up your game. Solution B: Get rid of clerics (or at least don't allow them as player class). Drawback: Clerics are integral part of D&D and, all in all, are also pretty cool. Solution C: Play it Vanilla (or, who gives a fuck about cults?!). Drawback: Describing cults in detail is very cool. Solution D: Re-design the Cleric class. Drawback: Then why D&D? Go EPT!

This was my thinking until two days ago. Then an unexpected epiphany: why not re-design pseudo-catholicism? Demons are outstanding, thus turn God into a Demon. So came The Unspeakable Trinity and The Church. The Church is about the same as the Roman Catholic Church: there's a Pope, it's founded on dogmas, preaches Free Will but still fights to convert people. The good stuff is that, confronted with a moral issue, you can easily figure out the answer (or, at least, how your local penguin** would answer.) If you want, it's a distorted version of Roman Catholic Church, way more violent against atheists, non-believers and heretics, and way more corrupted and racist. For instance, only humans can be accepted as the faithful: it's self-evident that demi-humans have no soul, and humanoids are creature of nightmares only good for massacre and stakes. The other big difference is that god (the Demon Lords of Sarnath) lives exists on Yaqqothl. And you know what that means? You're right, he is for fucking slaughtering. Also, note that, since god is basically a demon now, you can still have Magic-users on good terms with Clerics (aren't Magic-users active Demon worshippers? Of course they are.) Other cults now include animist (Druids), Other Demons (Magic-users), Cthulhu Mythos (Cultists Carcosan Sorcerers) and, of course, heresy. Medieval heretic cults. You know, like Pharisees rather than Stoics. You can still have some friction between Clerics and Druids, but, as in real world, not all the Cleric PCs have to be crazy fundamentalists (while every NPC has to be, because, be honest, it sounds better in the game.)
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*I can explain this better, if you need a more in-depth explanation, so please don't flame, just ask.
**Penguin is italian slang for nun, although some people (including me) also use it for priests. It's not offensive, it's the same as calling a man in tuxedo a penguin .