Not that I'm advocating for UUA, I'm atheist myself, but from what I've heard it sounds like a hippie commune focused around the bible.
The institution of traditional religion played a social role in Western societies that has not been adequately patched over by anything else yet. Even as a non-religious person, I do take seriously the hypothesis that the decline in regular church attendance accounts for some of the social isolation crisis. (That is of course, hardly the whole picture. A similar argument can be made about union meetings or youth clubs, both of which have also declined significantly in regular attendance over the last half century.)