I don't think this is as bad as it seems, at all. The only DIR that I ever went to was the Pagan one, as I had no need to go to any of the others. So I didn't pick the "Magic DIR" - so what? Can it honestly be expected that there will be
no discussion of magic in the Pagan DIR threads? No, of course we will discuss that there, as it's a part of Paganism. It will just be discussion focused to Pagan magic, rather than Thelmic or generic magic.
And interfaith discussion? There's nothing to say that threads made in
Interfaith Discussion (which is not set up as a debate stage, that's
Religious Debates) cannot be respectful. That, to me, would be the apt place to ask questions of another faith. And when that faith needs to regroup and join heads to come up with an answer unmolested, hey-o there's the DIR for them to do so.
Also when you pick one, it's the Greater DIR, including all the sub-DIR sections within. Having picked the Neopagan or Revival Religions DIR, I have access to the Reconstructionism, Paganism, and Wicca DIRs and everything therein.
UPDATE: I can also
view other DIRs, just not post in them.