That was a very cogent and well-supported reply, Leo. Even if one relegates religion to the category of "societal mechanism," it is still an essential part of our checkered past and hazy future. After all, there are many, many individuals who are not at all invested in the spiritual who are devoutly religious. It would seem that the world's truly unifying religion is Tradition, i.e. "My folks did it this way, so that's how we're doing it, by gum!" The benefits afforded by adherence to such traditions are well-documented, of course, but then again so are the drawbacks. It amazes me that the same people who will loudly denounce you for violating some tenet of the Bible will laugh in your face if you suggest they live by, say, The Code of Hammurabi.
Not that I'm spoiling for a feud with the devoutly religious, mind you. I am certainly in no position to prove/disprove the veracity of statements made in the Bible (or the Koran, or the Book of Mormon, or even "Gilgamesh." How the hell do I know if some giant bearded dude with a mean streak killed a tree-hugging monster, effectively pissing off his own Dad and wrangling a death sentence for his best friend in the process?), and I personally believe that faith and interaction with the deity of one's choice to be a personal matter. Religion happens in the church, faith happens in the heart.
Back to the original topic - I think Christianity is in no immediate danger, given the rabid mobilization of the fervently conservative in the last U.S. election. I often wonder about Christ's take on the modern version of the religion that bears his name (I'm leaning toward bemusement lightly seasoned with confusion and outrage).
As for the fate of religion in general - well, come on, folks, let's face it; some people are always going to need to feel they're better than other people, and these same people almost invariably indulge this need communally. So whether it's Christianity or Science or Trek Fandom (Reformed), there is always going to be rich soil in the human heart for the thorny vine of religion. We're not only wired to believe, we're wired to express that belief, even if what we believe in seems completely irrational (e.g. "Tlatl, there's a scary pink-faced man with metal skin and four legs walking toward the village! He wants to give us smelly blankets and borrow some of the shinier temple artifacts - he must be a god!")