Unitarians
Unitarianism is a religion that developed from Christianity in Europe in the 16th Century. Its name comes from its rejection the idea of the Holy Trinity in favor of a unitary God. In Unitarianism, Jesus is the Messiah and Son of God, but not God Himself. Thus, Unitarians reject key Christian concepts like the Incarnation, Virgin Birth and Resurrection. In the United States, the main body of Unitarians merged with the Universalists to form the Unitarian Universalist Association in 1961. The UUs (as they call themselves) are explicitly nondoctrinal, although most members would subscribe to some sort of liberal theology and many embrace Eastern religious concepts.
The Unitarians merged with the Universalists in 1961 to become the Unitarian Universalist Association, which has thrown out absolutely every religious tenet of Christianity in some form or another.