That's true, sorry about that. I actually wrote this piece many months ago, and it's a topic on which I have written extensively elsewhere. I've made the social-cohesion argument elsewhere, and I just forgot that I hadn't made it here. But here is the argument in a nutshell: we are social creatures, and many (if not all) of our social interactions are fundamentally based on shared subjective experiences: sharing the same meal, watching the same sunset, understanding the same proof. The religious trappings that tend to surround spirituality -- the holy texts and the prayers and the rituals -- can be understood as attempts to create social interactions anchored by the kinds of euphoric experiences I describe in my piece, the kind of experience that is hard to render into words beyond something like "Feeling the presence of the holy spirit" or something like that. It's the difference between looking at the grooves (which is what rational people tend to do when the look at religion), and listening to the music (spiritual experience), and going to a concert and getting carried around in the mosh pit (going to church).