The theological and like merits of the issue I leave to [MENTION=58172]Yaarel[/MENTION].What challenge is here? Does the player actually believe in the existence of these false gods? If not, then they cannot possibly believe in their efficacy nor should it be a violation of their piety
But I am working from this post:
Do I want a monotheistic campaign setting? The short answer is, yes.
<snip>
In a monotheistic game setting, the Divine normally intervenes only subtly and indirectly, because, the Divine desires humans to make the world a better place by means of human effort. The risk to humans is real. The good that humans do is real. Normally God is hidden. God is most ‘visible’ when other humans are doing good things. In other words, if the DM wants to supply the team with help via some NPCs or items whose opportune timing is ‘miraculous’, that can be fine and fun. But in terms of actual game rules, monotheism is part of the background flavor without any need for mechanical rules.
As I read that post, the divinity in the gameworld manifests just as (the monotheist we are discussing believes that) it does in the real world. In both cases, it is via providential events and human goodness. And so the monotheistic player is not, in playing his/her character, obliged to entertain or affirm the existence of any false god.
The actual gameplay challenges I identified upthread - one is about how to handle clerics (probably they have to go altogether - miracle-workers with a special connection to the divinity seem to be at odds with the providential/"via human goodness" account of the manifestation of the divine), and the other is about how to allow ingame events to be interpreted by players in a providential fashion (which rules out a certain sort of "hard sim" understanding of the randomness of the dice rolls corresponding to or reflecting the randomness of the gameworld).
As I also posted, the first of these challenges is not one I've ever tried to meet - my fantasy games typically have miracle workers drawing powers from divine beings. But the second is quite important to me in my RPGing, because I see it as necessary if a player is able to play a truly faithful PC, as opposed to a PC who naively believes in providence when the world is, in fact, a Conan-esque world of cold indifference to human concerns.