Dr. Dale Tuggy recently posted on a very important subject, one I’ve been trying to draw attention to here for quite some time: that most trinitarians view the Trinity itself as a person, creating a fourth divine person. You can read his post here. The result of such a view is that the Trinity is not truly a trinity, but a quadrinity, and that the one God of the Old Testament is not the same person as the one God in the New Testament.
After all, according to trinitarians the one God of the Old Testament, YHVH, is supposed to just be the Trinity. And if the Trinity is indeed a self or person in its own right, then since this person or self is Father, Son, and Holy Spirit together, it is distinct from each (since the Father, for instance, is not Father, Son, and Holy Spirit together). But in the New Testament, this person has disappeared- the one God is always identified as one person of the Trinity, the Father (Jn 17:3, Eph 4:6, 1 Cor 8:6). So now we will have a situation where the one God of the Old Testament and the one God of the New Testament are not the same person, but two different selves or persons. While “God the Trinity” is the one God of the OT, in the NT we can only find “God the Father” identified as the one God.
This is why I have suggested before that in some respects, this semi-modalistic, four-person trinitarianism is really ancient gnostic heresy repackaged- after all, denying the identity of the one God of the OT with the one God of the NT, the Father of Jesus, was one of the main crimes of ancient gnostic heresies, something ancient writers like Irenaeus repeatedly argued against.
I’d also like to comment briefly on something the trinitarian Dr. Tuggy interacts with in his article says:
God acts and speaks as one quite a bit. Scripture affirms God is one. It also affirms God is three by identifying three distinct persons as God.Andrew Schumacher
Here we read what I think is a pretty standard line for trinitarians, that the Bible presents God as one, but also as three. As I’ve noted elsewhere, this isn’t actually the case: while the Bible is explicit from cover to cover that God is one, we lack any statement in any book of the Bible that God is three. That is in itself a reason to be unitarian and not trinitarian, since to be unitarian is simply to affirm what the Bible actually states, and no more, while to be trinitarian involves not only believing something never stated by the Bible, but in particular something never taught by the Bible which actually contradicts what the Bible does teach. After all, it is a contradiction for the same individual thing to be numerically one and three.
But note the attempt to shoehorn in that the Bible teaches God is three: he says that the Bible teaches God is three by ‘identifying three distinct persons as God’. Firstly, we may note that one of these persons, the Holy Spirit, is never clearly identified as God– something which must be a major embarrassment to trinitarians. But secondly, even if the Spirit, like the Son, was sometimes called ‘theos’, ‘God’ or ‘a god’ (both are equally legitimate Greek translations), this would not be the same thing as saying that the Son and Spirit are the same one God. That is to say, showing that three persons are each God in some sense and showing that the one God is three persons are not the same thing.
That’s because the Bible freely speaks of there being “many gods” in a lesser sense; for example, human judges and rulers in Israel were called “gods” (Ps 82, Jn 10:34-35), and likewise angels are also called “gods” (Heb 2:7, compare Ps 8:5). So according to the Bible, there’s no contradiction in there being one God, YHVH, God Almighty, Who is the “Most High God”, “the God of gods”, and there being in a lesser sense “many gods” (1 Cor 8:5). So, if the Messiah (who is always described simply as a man) is a God, and if the Holy Spirit were a God (something that cannot be shown from the Bible), this would still fit well within a unitarian framework- nothing about it would imply that the one God is multi-personal.
For a trinitarian to show that the one God is multi-personal, despite the way scripture constantly speaks of Him as a single person, they will need to do more than show that other persons besides the Father (Who is explicitly equated with the one God several times) are called “God” or “a god”; they will need to show that the Bible actually says that the one God, the Supreme Being, YHVH, is more persons than one, the Father of the Lord Jesus Christ. This, they cannot do.