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Unitarian Universalist
Given that Unitarians did not believe in the divinity of Christ, "many" Christians never considered Unitarians to be Christians, starting way back in 325 CE. Based on that one aspect of belief, UU Pantheists (as well as a whole host of other types of UUs) are closer to Unitarians of 325 CE than the majority of professed-devout Christians are today. (That's actually not as remarkable of a statement as it may sound, so if you think it is, read it a few more times.)"Unitarian" is a label for Christians who felt the Trinity was not a biblically-based or provable doctrine, and that the oneness of God is absolute.
And again, many UUs, today, are closer, with regard to one critical aspect of believe to the original Univeralists than "those" Univeralists were ever to the majority of professed-devote Christians today. (Another statement most notable for not being remarkable.)"Universalist" regards a doctrine of heaven and hell, rejecting the idea of eternal damnation, preaching the eventual salvation of all souls by a loving God
UUs are the result of a very natural progression, stemming from the schisms that developed within Western religious perspective, over the last couple of millenia. The two aspects, Unitarianism and Universalism, are embraced, in a suitably modern form, by many UUs today.
I think "UU" works great.In any case, this "mouthful" is holding us back.