" Montanist Christians like Tertullian believed that Jesus possessed the same divine quality as God, but not in the same quantity as God. Modalist Christians conceived of the Trinity as representing God in three successive modes of being: first as the Father, then as the Son, and finally and forevermore as the Holy Spirit. Nestorian Christians argued that Jesus had two completely distinct natures—one human, the other divine—while Gnostic Christians, especially those called Docetists, claimed that Jesus only appeared to be human but was in fact fully God. "

― Reza Aslan , No God but God: The Origins, Evolution and Future of Islam