Or even worse than that....Unitarian Universalists.
Which is a fancy way of saying........nothing.
Modern Quakers are pretty far out there as well. I was informed by a recent convert that he liked it because you didn't have to believe in God. You just follow your "inner light." Many of the most loony far-lefties in this area are "Quakers," at least in name. I've never seen any indication they have any knowledge of Christian beliefs.