I think that a bunch of basic social functions started out as religious and are now carried out by atheists and the like (marriages, potlatches, etc.). In a pre-scientific world, everything was religious. What is a church but community and religion? If we can strip the religion from marriage, why not church? I know atheists who attend Unitarian Universalist churches for the community (and my parents took me as a kid, my dad an atheist and my mom a mushy-not-really-religious-but-believes-in-somethingist). It's not for me, but that's probably a social issue related to how I respond to those sorts of groups and not really related to religion. Secular churches do exist.
In my experience (15 years or so) most people who attended my church didn't rush home or spend any time outside of church worshiping/praising their god. Even when I was at church, outside of the sermon, no one was talking about god or religion. Hell.. in my experience, with my religion, most people have never even read the book that the religion was based off of and knew very little about it when quizzed and yes I did quiz them from time to time.
So, aside from a few outliers, I have always been under the impression that most people attending church get far more enjoyment from the social aspects than the religious ones.
My experience is the complete opposite. Of course there's the social aspect, but almost every family had their own devotions they did outside of church. I remember clearly our teachers asking everyone in our class of 30+ in Catholic school to share our family's family-specific religious traditions. I think coming from a tradition rich with symbolism and tangible activities as devotions (Catholicism) helps with that.
