Unitarianism (from Latin unitas "unity, oneness", from unus "one") is a Christian theological movement named for its belief that the God in Christianity is one person, as opposed to the Trinity (tri- from Latin tres "three") which in many other branches of Christianity defines God as three persons in one being: the Father, Son, and Holy Spirit.[1] Unitarian Christians, therefore, believe that Jesus was inspired by God in his moral teachings, and he is a savior,[2][3] but he was not a deity or God incarnate. Unitarianism does not constitute one single Christian denomination, but rather refers to a collection of both extant and extinct Christian groups, whether historically related to each other or not, which share a common theological concept of the oneness nature of God.