 Mainstream Christians characterise this teaching as the heresy of Binitarianism, the teaching that God is a "Duality", the Father and the Word, or "two-in-one", rather than three.Oneness Pentecostalism, as with other modalist groups, teach that the Holy Spirit is a "mode" of God, rather than a distinct or separate person from the Father.They instead teach that the Holy Spirit is just another name for the Father.