I heard about this pretty recently, coincidentally a couple of months after I'd started wondering how hard it would be to put an organization like this together. I was brought up in an occasionally churchgoing family, and I always missed the community spirit, the ice-cream socials, the charity and good-fellowship and all that happy crap. I heard that there's a Sunday Assembly congregation getting together on the Westside of L.A., but honestly I think I'd prefer something a bit smaller and more neighborly, as well as closer to Pasadena. I may never get around to joining, if for no other reason that I have always appreciated my uncommitted Sunday mornings since I stopped hanging out with the formal God-botherers back in the 1980s, but every now and then I think about it.
I probably have neither the time nor especially the competence to put together my own community, but if a congregation starts up somewhere east of, say, Silver Lake, I'll swing by and check it out.
Whether or not it meets my own needs, however, I heartily approve of the idea. With or without the superstitions, we are a very social species, and I can see this doing a world of good for people who miss out on the community of church membership but can't stomach the silliness.