Since you believe that Jesus Christ is a man only with only one nature, i.e human being then please explain what the Apostle Paul stated at Philippians 2:7-8? "but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men. Verse 8, And being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross."
Moreover, since Jesus is a 100% human being why does the writer of Hebrews at Hebrews 5:7 say, "In the days of His flesh." Or at Hebrews 10:5, "Therefore, when He comes into the world, He says, "Sacrifice and offering Thou hast not desired, But a Body Thou hast prepared for Me."
So to sum up! You say Jesus is a 100% human man with only one nature, that is human being. Why is it regarding the verses I posted have to explain this man Jesus becoming a human being and had to have a body prepared for Him?
I believe that from the moment of creation Jesus was a human with a glorious body (just like he is now). But when he was born to Mary he exchanged his glorious body for a mortal body.
So the "emptied Himself, taking the form of a bond-servant, and being made in likeness of men" refers to when Jesus' glorious body was changed to a mortal body to be made like us so he could make reconciliation for our sins.
Now, how do YOU explain it?
Trinitarians normally say "what he was, he remained" and "human nature was assumed". (Catholic Catechism 469-470) So nothing was "given up" so to speak.
Here is an overview of what I believe...
For this creation, YHWH God (the only one who transcends all creations) determined to create a universe with a kingdom of redeemed humans (living souls) for his glory where he would reign as a living soul himself. The Scriptures describe how God would accomplish his plan. In an instant, transcendent God (called God the Father) created the supernatural and space-time of this universe and also became immanent as a spirit (called the Spirit of God) and in the form of a living soul (called the Word of God) with a glorious body. God the Father then created all things within the universe by the power of the Spirit of God commanded by the Word of God. But whereas God created a human spirit and soul for each of us, God himself as the Word became the human spirit and soul of Jesus. At his conception, Jesus' glorious body was changed to a mortal body to be made like us so he could make reconciliation for our sins. At his resurrection, Jesus' mortal body was changed back to a glorious body and he will also give each of his elect a glorious body when he returns to reign in his kingdom forever.