structural:summarization
Arianism

Arianism is often considered a form of Unitarianism.

The Christology of Arianism holds that Jesus, before his human life, existed as the Logos, or the Word, a being begotten or created by God, who dwelt with God in heaven. There are many varieties of this form of Unitarianism, ranging from the belief that the Son was a divine spirit of the same substance (called Subordinationism) or of a similar substance to that of God (called Semi-Arianism) to the belief that he was an angel or other lesser spirit creature of a wholly different nature from God. Not all of these views necessarily were held by Arius, the namesake of this Christology. It is still Nontrinitarian because, according to this belief system, Jesus has always been beneath God, though higher than humans. Arian Christology was not a majority view among Unitarians in Poland, Transylvania or England. It was only with the advent of American Unitarianism that it gained a foothold in the Unitarian movement.

Among early Christian theologians who believed in a pre-existent Jesus who was subordinate to God the Father were Lucian of Antioch, Eusebius of Caesarea, Arius, Eusebius of Nicomedia, Asterius the Sophist, Eunomius, and Ulfilas, as well as Felix, Bishop of Urgell. Proponents of this Christology also associate it (more controversially) with Justin Martyr and Hippolytus of Rome. Antitrinitarian Michael Servetus did not deny the pre-existence of Christ, so he may have believed in it. (In his "Treatise Concerning the Divine Trinity" Servetus taught that the Logos (Word) was the reflection of Christ, and "that reflection of Christ was 'the Word with God" that consisted of God Himself, shining brightly in heaven, "and it was God Himself" and that "the Word was the very essence of God or the manifestation of God's essence, and there was in God no other substance or hypostasis than His Word, in a bright cloud where God then seemed to subsist. And in that very spot the face and personality of Christ shone bright.") Isaac Newton had Arian beliefs as well. Famous 19th-century Arian Unitarians include Andrews Norton and William Ellery Channing (in his earlier years).