General question here:
Why, rules-as-written, does the World need to know that there are no gods? Why can’t the World have the same ambiguity that the player has?
Also: If the World does have to know that there are no gods, right now (that is, there is a resolution to the Priest’s conflict between faith and doubt, and doubt should win), then, shouldn’t the World note go in, like, a separate World section, so that the player doesn’t see it? If they see that sort of information, that could really deflate the struggle between faith and belief for some players–to know that there are, in fact, no gods, rather than to be in conflict.
Thoughts?
The World needs to know that there are no gods, because there are none, so anything that they come up with has to have some other plausible origin, justification, rationale. It's simply the most practical and sane technique to help the World play the game in the correct way with the least difficulty and fatigue possible.
As for the Player side... I believe you might have misinterpreted the core conflict at the heart of the Priest class ;-)
Faith (in this game) is about the belief of a person in the fact that their actions and choices can be justified by something external. The conflict is NEVER about checking if this external thing exists or not. The conflict is ALWAYS about reflecting on the Priest's own choices and actions and what do they believe them to mean: are they justified? do they feel right? what do they say about you? and now? and now? how about now?
It's not a puzzle to be solved, it's a mirror to be stared at.
Of course this is ingrained deep within a frame of wonder and adventure and exploration :)
So while the game as a whole, it being an imaginary adventure, can offer the enjoyment of an escapist power fantasy... religion in the game is not allowed to itself be lived as an escapist power fantasy.
It is then irrelevant whether the deity exists or not... you as a Player are agreeing to dress the role of "a person that believes in a religion", same as you might dress the role of "a person that is an elf" or maybe "a person that believes might-makes-right" etc. Part of the fun IS in having the Priest actively look for things in the game that feel like a divine sign or omen, while World can toy with the notion of presenting situations that could be ambiguous and play on such expectation (is it a miracle? is it a sign?). If this is interesting to a Player, then ok. Otherwise they should probably play another class. Either way hiding the fact that gods don't exist would be a dishonest "gotcha" at the expense of the Player... something that runs quite counter to this game's core philosophy.
Does this make sense? :)