I'd actually taken this "Belief System Selector" quiz before over a year ago, but I've seen it floating around LiveJournal today. I took it again and I think my results are--close to what they were before, although I think Secular Humanism flipped with Theravada Buddhism.</p>
Unitarian Univeralism (100%)
Liberal Quakers (98%)
Secular Humanism (92%)
Theravada Buddhism (84%)
For the record, coming in last was Jehovah's Witness, at 9%.