That's one of those questions that depends on how you define words. It simply depends on how you define "Christian". "Universalism" has long been considered a heresy by many Christians, of course.
A Unitarian is someone who believes that he or she is to good to be damned, while a Universalist believes that "god" is too good to damn anyone. These days there are many Unitarian Universalists who choose not to call themselves "Christian", although, of course, some still do.
Technically, a classical Unitarian held that the Father came first, with the Christ and the Holy Spirit both proceeding from the Father, yet before the Universe we inhabit came to be. But yeah, they got a bit wishy-washy IMO and came to hold that all forms of the Divine are united into a single Unitarian whole. At least around here, I'd say that a minority of UUs consider themselves Christian, unless one includes those who think Jesus was a great teacher/philosopher/rabbi but not necessarily Divine himself. (Or at least no more than any other person might have the potential to be Divine.)
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