Agreed. IMHO the roots of communism began with the belief in Unitarianism (that Jesus isn't divine and God is not a Trinity). Once that became in vogue among the wealthy in the west, Karl Marx's Liberation Theology became more attractive and was the next step downward.
Details:
Liberation Theology is based on Marx's dividing up everybody between the have's and the have not's, with the have's always evil and the have not's always the heroes and should be in charge (by having government more involved in our lives so evil capitalism can't control us, at least as Marx put it). Marx both hated religion when it suited him, and loved it when he could use it to push Marxism. So in Liberation Theology, Jesus is redefined as being just a poor member of the have not's Who was never divine -- the kind of person who would embrace more government to protect the poor.
The founder of the John Birch Society, Robert H.W. Welch Jr., was an old time classical Unitarian (and an evolutionist as well).
One of the most conservative and pro-Confederate people I know personally is a Oneness Pentecostal.