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I have heard that some non-trinitarian Christians reject the concept of the trinity and say that there is only one indivisible divinity. Are there any Christian denominations that believe in a "duality", i.e. that there are exactly two persons in the god-head?

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I would suggest that there is a duality between God and Satan as one governs heaven and one hell. I do not know of any denomination which does not have the three entities of the trinity - whereas some consider them three distinct entities and some believe that it's one entity in 3 forms. That's the general difference between nontrinitarian (unitarian) and trinitarian. – The Freemason Dec 12 '13 at 18:52
Just a note, the form "Do any x, y?" isn't a particularly productive line of questioning. Why not ask about something more specific so you can learn. You should be able to determine whether something exists fairly easily with a google search, so if something interests you, do that first and if you have more specific questions ask those. – wax eagle Dec 12 '13 at 19:14
@Freemasonthesatirist Dan - you do realise that dualism (God v. Satan) has historically been considered heresy by Nicene Christianity, based mostly on its incompatability with Scripture, right? – Affable Geek Dec 12 '13 at 19:23
@AffableGeek apparently I do not realize that. I should have said, "I would suggest that there is a case for duality between God and Satan..." as I am not suggesting that there really is - but the argument can be made. – The Freemason Dec 12 '13 at 20:49
Note that in the context of the question, there's a big difference between Dualism -- the idea that God and Satan are equal but opposite, and the duality that I think the questioner is asking about. I think he's driving more at a theory that only two of the traditional three persons of the Trinity are real, like a belief that Father and Holy Spirit are God but Jesus was just an ordinary man. – Jay Dec 13 '13 at 5:25

In theory, all Nicene Christians are Trinitarian, based on their assent to the Nicene Creed, which states among other things that they believe in:

  • God, the Father Almighty, maker of heaven and earth
  • one Lord, Jesus Christ, the only begotten Son
  • the Holy Spirit.

Furthermore, any Christians who subscribe to the Athansian Creed will also state:

For there is one person of the Father, another of the Son, and another of the Holy Spirit. But the Godhead of the Father, of the Son, and of the Holy Spirit is all one, the glory equal, the majesty coeternal. Such as the Father is, such is the Son, and such is the Holy Spirit. The Father uncreated, the Son uncreated, and the Holy Spirit uncreated. The Father incomprehensible, the Son incomprehensible, and the Holy Spirit incomprehensible. The Father eternal, the Son eternal, and the Holy Spirit eternal. And yet they are not three eternals but one eternal. As also there are not three uncreated nor three incomprehensible, but one uncreated and one incomprehensible. So likewise the Father is almighty, the Son almighty, and the Holy Spirit almighty. And yet they are not three almighties, but one almighty. So the Father is God, the Son is God, and the Holy Spirit is God; And yet they are not three Gods, but one God. So likewise the Father is Lord, the Son Lord, and the Holy Spirit Lord; And yet they are not three Lords but one Lord.

The groups that do not adhere to the Athansian Creed are what are often called the "Oriental Orthodox," meaning things like the Syriac church, the Chaldeans, and various Eastern Orthodox churches. Percentagewise, these are very small, and their quibbles are less about the Trinitarian nature than about Christology.

To find a Christian denomination then that is non-Trinitarian, one must specifically look outside of the "mainstream" church. All Catholic, Orthodox, and Protestant denominations nominally hold this. (I say nominally, because many Christians are in practice bi-nitarian, neglecting the Holy Spirit - but if you go by profession, they are Trinitarian).

Your best bet for a dual-Godhead would be the Mormons. They believe that Jesus and God the Father are separate entities altogether. Jehovah's Witness are monotarian, rejecting the divinty of Jesus altogether. Finally, Unitarians, as their name implies, reject Trinitarianism. That said, many Christians would not include these groups within that definition.

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+1 for bi-nitarian – The Freemason Dec 12 '13 at 20:52

There are Christians of all types actually. There's the trinitarians, the binitarians, the unitarians, and the modalists as far as the subject of the godhead goes. The term "Christian" is not based on any one specific of these terms or concepts. It's completely false to say that someone is not a Christian because they do not ascribe to a specific one of these concepts. Although most of the time it's easier to find the trinitarian denominations as these are the ones who really try to force others to believe as they do. Denominations who hold to any of the other concepts are not nearly as militant and are therefore not as obvious to perceive as the trinitarians. However, always remember that it is being saved by the blood of Messiah that makes us Christian. Not a specific concept of the godhead.

The Armstrongites believed that there were two in the godhead and some Anabaptists are modalists.

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