I think it's sad that college only lasts four years. From Putnam's description of a megachurch, it sounds to me as though it supplies a college-like experience to those who participate. For instance, it targets different worship environments to different customers. (Just as a college allows you to choose which courses you want to take.) Want to listen to rock n' roll before a sermon? They have a room for that. At the heart of the megachurch experience are the small groups of worshipers who meet to share an interest and to connect on a more personal level. (College, after all, would be nothing without friend groups, sports teams, musical groups, and so forth.) People in the small worship groups have personal conversations in which they share real details of their life that trouble them, much like one would do in a late night dorm conversation. The megachurch is also very corporate, just like a college. Its administrators sit behind desks, on comfy chairs, in plush offices. Its messages embrace America's corporate ethos ("Jesus, be the CEO of my life") just like a college tries to match its graduates with jobs in the real world. Much of its message is educational in a "self help" sense -- talking about how to apply your talents optimally. God really wants you to get rich, after all, and so does the dean of students, because you might choose to give back.
So as much as I would like the megachurches to be more inclusive, and as much as I am sad that they partly mirror the secular world's obsession with power and status, nevertheless I can't help but feel they are better than the total absence of meaningful community that many people experience after college ends. I shouldn't criticize them unless I know of a better alternative, which I don't.
For a definition of community --
Putnam (and other researchers in social capital) often ask people "do you think others are generally trustworthy?" One could also ask whether the people in the community can accomplish things together. Another question might be whether people willingly sacrifice for their community. I like the idea of "wakefulness." I associate community values with: humility, friendship, nurturing, loyalty, fairness, equality, etc.