Go talk to Clyde!
Clyde Grubbs on his blog offers a wonderfully thoughtful post about UU theological diversity and the common thread of humanism that runs through all of our otherwise varied UU approaches to religious understanding. He argues (I think) that it's this common thread of humanism that keeps us from devolving into a Balkanized collection of essentially separate faith communities. (I think he's right, but I also think he's only able to say this, and I'm only able to agree, by defining humanism somewhat differently than the Manifestos do.)
Click the link and enjoy the read. It's definitely worth reading and responding to.