Pagans are not a Community nor a Tribe -- Not Yet
Not yet, anyway. We are still part of modern society with its cafeteria spirituality.
Many Pagans, such as Emma Restall Orr in her book that I recently reviewed, are fond of the idea of "tribe."
Jews, for example, are a tribe (or several). A Jew might never cross the threshold of shul, synagogue, or temple--may even be an avowed atheist--but he or she is still a Jew. Only conversion to one of the other Abrahamic faiths might change that fact -- after a time -- and even then, you still have "crypto-Jews" popping up. (Everyone wants to be special.)
A Navajo Indian might follow traditional religion, Mormonism, some kind of Christianity, or the Peyote Road, but is still a Navajo.
What we have is a network, not a community nor a tribe. Maybe in a few generations that will change, who knows? (For you anthro and sociology majors, it is the Gemeinschaft / Gesellschaft issue, no?)
Everytime I hear someone going on about "the Pagan community," I say to myself, "Not yet." Not when you can walk in and walk out so easily.