I've been working on an unauthorized implementation of Dresden Codak's Dungeons and Discourse, a fictional role-playing game that combines philosophy and high fantasy. You can find a very error-ridden, but possibly usable, rough draft of it at http://www.raikoth.net/Stuff/ddisplayer.pdf. Yes, obviously this is crazy and I have no life. There is no need to point that out further.
I'd like to try to run a campaign. It would be maybe an hour or two a week on IRC, and subject to my schedule, which is terrible and can include disappearing for months at a time (in particular I probably won't have internet access in August). Still, I would like to at least gauge interest and start some preliminaries now. And if anyone wants to run a campaign IRL at a meetup group or something, I can send them the file with the campaign walkthrough, though I'm not sure how much I would recommend it at this point.
Anyone who's interested in participating please let me know (especially if you have philosophical beliefs wildly different from the standard Less Wrong hive mind, or if you know any interested parties who do, since the game would be dreadfully boring if everyone agreed on everything or for that matter anything). Also, I suppose if people want to record the errors and contradictions and non sequiturs and exploits in the manual you might as well post them here so I can fix them.
In the campaign, the atheists are trying to fight/destroy the gods, who they believe are false gods distracting from the worship of the true gods Truth and Wisdom. I didn't want to make that too obvious in the book because it might limit the usefulness of the classes in other settings.
So you're atheists are actually nay theists... If that's the case I have difficulty imagining how a group containing both atheists and theists could work at all...