I suspect this thread does a pretty good job of keeping most the relevant conversation in a single thread. This is testable. Just lock the thread and see if we end up with a dozen active threads in its place.
Anyway, if you want it locked in hope that people shut the hell up about such things, I fear you'll be sorely disappointed with the results. God and organized religion and so forth are awfully interesting (important, even) to an awful lot of people. This thread's not to blame.
I would, however, support locking this one if the length stresses the server (bandwidth-wise I'd assume). I think that's why the old Future of the Fortress thread(s) (how many have there been?) were occasionally "refreshed." The current one's easily the largest thread I've ever seen (read: I probably haven't visited enough forums) though, so I doubt that's a problem since the forum software was changed/updated. In that case, there's no good reason to lock it. It obviously bothers you, but you should at least try to ignore it, even if it makes your ass twitch. It definitely serves its purpose here, nefarious as that may be.