Of these views:
- God is three persons, but also a single person (Trinity Mystery).
- God is three distinct persons (trinitarian).
- God is two distinct persons (binitarian).
- God is only one person (unitarian).
The first case requires that the incarnated Jesus was both fully human and fully God, since even as a human, the Son is still part of the one God.
And the last case denies that Jesus was ever God, so there is no issue of his having the divine nature.
But those that believe Jesus was God, a separate being equal (in power but not in authority) to the Father, can believe that the incarnated Jesus gave up his divine nature and became a fully human being.
For these denominations, the answer about which nature was dominant is trivial: Jesus had only one nature, human nature.
Consider what some translations of Philippians 2:7 say about the human Jesus:
- NLT: he gave up his divine privileges; he took the humble position of a slave and was born as a human being.
- NIV: rather, he made himself nothing by taking the very nature of a servant, being made in human likeness.
- YLT: but did empty himself, the form of a servant having taken, in the likeness of men having been made,
As a human being, Jesus had no divine nature; he voluntarily gave it up in order to become the Saviour.
All that he had was exactly what all fully converted and baptized Christians have, a connection to the Father through his holy spirit.
He of course always knew how to fully use that connection, but it was not a power that isn't equally available to other human beings.
Fully baptized and converted Christians have a connection to the Father, because their human spirit has been combined with holy spirit.
This newly formed entity, which contains both the original human spirit (what we consider as ourselves) and holy spirit, lives, grows, and develops within our physical selves:
Therefore we do not lose heart. Even though our outward man is perishing, yet the inward man is being renewed day by day.
— 2 Corinthians 4:16 (NKJV)
For this reason I bow my knees to the Father of our Lord Jesus Christ,
from whom the whole family in heaven and earth is named,
that He would grant you, according to the riches of His glory, to be strengthened with might through His Spirit in the inner man
— Ephesians 3:14–16
At their resurrection, the "inner man" of all saved Christians will receive a divine nature, just as Jesus's divinity was restored to him at his Resurrection.
Grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord,
as His divine power has given to us all things that pertain to life and godliness, through the knowledge of Him who called us by glory and virtue,
by which have been given to us exceedingly great and precious promises, that through these you may be partakers of the divine nature, having escaped the corruption that is in the world through lust.
— 2 Peter 1.2–4
But most importantly, the very idea, that Jesus as a physical human being still also retained his divine powers, denies the most essential part of Christianity.
If Jesus weren't human, if he weren't capable of temptation and sin, if he didn't risk the penalty of eternal death, then what was his incarnation all about?
John 3:16 would be meaningless if the Father didn't literally "give" his Son, putting his eternal life at risk.
What was one of the biggest heresies that threatened the first-century Church?
"...Every spirit that does not confess that Jesus Christ has come in the flesh is not of God.
And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world" (1 John 4:3; compare 2 John 1:7).
Denying Jesus Christ's humanity leads people away from the truth of God.
If He had not been truly human, then His sacrifice for our sins would be null and void.
Yet this same heresy that afflicted the early Church persists even to this day, creating doubt and confusion as to Jesus Christ's true nature and role.
— From Bible Study Course, Lesson 3, "Why Did God Create Man"
— Published by the United Church of God.