re: So what would be the rules/guidelines of a Religion & Philosophy Board?

It's just that you have numerous parties at work here.

You have the theists, who enjoy genuine discussion of religion and want to openly engage in conversation on various religious topics without arguing with other users.

You have the avid atheists who seek out and destroy any thread pertaining to religion in an effort to humiliate the religious posters and establish intellectual dominance.

You have the trolls, who could also be members of the two previous groups, but will post and create threads specifically to incite those with opposing viewpoints.

And a dedicated board to host all of this would simply result in a paroxysm of continuous conflict and rage.