I think that, while there's some truth in what you say, you're twisting yourself into intellectual knots to avoid having to reify (and thus admit to) arrogance. As far as atheism goes, I think you were much more on the money with your post about untheism and antitheism: in a secular society, untheism is rarely an issue, but antitheism (like all proselytising belief-systems) is very annoying to the recipients.