Unitarianism
This theology ranges from the belief that Jesus was merely a great man filled with the Holy Spirit (sometimes called Psilanthropism or, more commonly, Socinianism) to the belief that he is the incarnation of God's impersonal Logos. It is associated with early church figures like the Ebionites, Theodotus of Byzantium, Artemon, and Paul of Samosata in the early Church, Marcellus of Ancyra and his pupil Photinus in the 4th century AD, and Michael Servetus, Ferenc Dávid and Faustus Socinus in the Protestant Reformation. It is from the latter that we get the word "Socinianism," but the teaching of Socinus is unique in more than just its Christology, and so the name is best not used as merely a Christological term.