@ GodBeliever
When all things are subjected to Him, then the Son Himself will also
be subjected to the One who subjected all things to Him, so that God may be all in all."
1 Corinthians 15:20-28
Christians are not disputing the fact that Jesus will one day subject himself to the Father. The reason that you feel compelled to cite verses like this is because a template has been installed in your head by your WT trainers. Like a trained seal you and every other JW continually try to frame this topic as an either or scenario. But, it is not an either or scenario, it is a both scenario. Regardless of the countless times that the Bible and Christians present a portrait of Jesus as BOTH God and Man, JW's are trained to ignore this and just keep on arguing a point that no Christian has a problem with.
Allow me to explain to you the biblical and Christian view.
Jesus, the son of Mary is just as human as you or I. As such, God is obviously greater than he is. If the body is all there is to Jesus, then that would be the end of the discussion. Jesus is not God - and the bible contradicts itself.
However the WT has taught a view that is foreign to not only the bible, but ancient peoples themselves. It is a heresy.... a very important one.
God has explained how we are made. We are constituted of three parts - soul body & spirit.
The bible writers assume that the reader understands that fact. The view that we are only a body and that the soul is just our bad breath and your spirit is simply electricity - is a belief that is found in the modern worldview of Materialistic Naturalism, not the bible. Several false philosophies of the 18th and 19th centuries laid the groundwork in which Materialism could later take root and grow. The WT bought into this.
The WT is a hybrid worldview. While believing in a First Cause, they deny that we ourselves are anything other than a body when it comes to personhood.. Yet God says that, like him, we are a tri-partite being:
1 Thessalonians 5:23 - And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ.
Hebrews 4:12 - For the word of God is quick, and powerful, and sharper than any two-edged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
In language, personal pronouns denote personhood. He, she, I, they, etc. The bible assumes that the reader understands this 3rd grade grammar. For example:
Rev. 6 - I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
See all the personal pronouns? They are disembodied PERSONS who can think, speak, remember, complain and be comforted.
The bible is full of examples like this:
1Co_5:3 For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed,
Isaiah 26:9 With my soul have I desired thee in the night; yea, with my spirit within me will I seek thee early
I have many more biblical examples of the personhood of the the soul and spirit if you would like to see them. These should suffice to show that in the bible your body, soul and spirit are all characterized as YOU, AND NOT AN IT like the WT tries to present.
This understanding very quickly clears up the supposed mystery. Jesus' body is the son of Mary, making him fully man. The spirit of Jesus was supplied by God himself. "God is a spirit". God is indivisible being omnipresent So, Jesus is fully God as well.
This is why the bible calls him God's only-begotten (begotten means out of his essence) son. Angels were created but Jesus came out from the essence of the Father. This was a onetime, single solitary never-to-be-repeated event for all eternity.
The bible teaches that Jesus is both God and Man at the same time. This is why Jesus (physical son of Mary) could say that the Father is greater than I am, and later proclaim that he possessed ALL POWER IN HEAVEN AND EARTH.
This chart illustrates how Jesus is both fully Man and fully God:

Understand Now?