Jewish monotheism came first in the church.
The average trinitarian isn’t likely to tell us that because the average trinitarian doesn’t know it. There are, of course, many trinitarians who do know and will tell anyone who asks about it.
I’ve quoted many trinitarian scholars when speaking about church history who’ve acknowledge this historical constraint. For example -
”To call Jesus Son of God was therefore to accept the claim implied in his words and actions that he was totally obedient to the divine will, that he could give authoritative teaching about God, and that he was empowered to act as God’s authorized representative and agent. … the notion of a teacher and leader fully authorized by God, disobedience towards whom would be tantamount to repudiation of God himself, was well understood in the Old Testament.
The crucial text is Deuteronomy 18:18-20: …”
(A.E. Harvey,
Jesus and the Constraints of History, p. 164)
The concept of agency isn’t a man-made tradition, as has been asserted repeatedly in this thread (and others). It is the cultural context of Hebraic / Jewish thinking.
”Jesus, in his teaching, his prophetic actions, and in his obedience which led to his death, was acting as God’s agent and representative on earth. It was as if, when he spoke and acted, God himself was present. In Luke’s phrase, ‘God was with him’; in Paul’s, ‘God was in Christ’. That this was so had been demonstrated by the resurrection, after which Jesus had necessarily been given the highest place, under God, which could be awarded to any living being. Christians could now confidently join in the worship and praise due to the one who had been given (again under God) a name which is above every name, and through whom the Holy Spirit was now active among those who acknowledged his lordship. It was as far as one could possibly go (these Christians felt) in ascribing unique dignity to Jesus consistently with respecting the constraint of monotheism.”
(Ibid., p. 173)
That isn’t Nicene Christianity. That’s Jewish monotheism; the monotheism of primitive Christianity.
The author didn’t bold the remainder of the quote. I’m going to do that in order to emphasize my very simple point.
”In later times the church, no longer perceiving the power and decisiveness of the agent-son-representative model, and having among its members men used to a more philosophical analysis, felt it necessary to go further in the direction of metaphysical identity between Jesus and his heavenly father: released from the constraint of Jewish monotheism, gentile Christians began to think of Jesus as also, in some sense God.”
(Ibid.)
That’s where Nicene Christianity came from.
The trinitarian scholar is giving us a brief, but superb, synopsis of church history.
Nicene Christianity anathematizes Jewish monotheists who believe Jesus is the Messiah, Son of God. Primitive Christianity certainly doesn’t.
Primitive Christianity - which is where I’m properly located on the church timeline - preceded Nicene Christianity by several centuries.