I kind of have a love/hate relationship with America's churches.
At their best, they serve a very important purpose... both community and spiritual. Spiritually, they keep people on their toes, constantly challenge them with new sermons and new Biblical passages that they might not have found on their own, and freely give wisdom from people who have more experience with Biblical texts and life experience. Plus the church can be truly amazing in community-building, in bringing people together, and in collecting money to back charities and community outreach projects, doing a whole lot of good for everyone.
This spirituality focus is actually very unique to America. The experience of church in Europe, for example, is more of a social experience, where people were expected to go to church not necessarily out of a need to refresh oneself spiritually, but rather out of obligation to nation and family, supporting the local ministry and uniting individual areas under one roof. Where in America it is almost completely about beliefs. Even small towns can have several different churches, all of which differ only slightly in doctrine, and yet those tiny differences are enough for each church to declare that it's worth starting a different sect over. It's so much about minute differences in the religious aspect, that often it can be a divisive force more than a community-building one.
This is where the hate part of the love/hate comes in. Because at their worst, churches can be nothing more than a bunch of stuffy politically like-minded people patting each-other on the back each Sunday for how great they are and how wrong everyone else is.
So to answer your question, I'd say that in America church is very much a religious experience more than a social one. Some of the older European churches like the Catholic church are still very much social, where people go out of family obligation more than to really be spiritually inspired, but pretty much all of the protestant branches are a more religious experience in America, where it's all about what is preached and which one of these interpretations is right. It can often divide communities more than it brings them together because of this.