So to answer the OP….
Yeshua did not have a sin nature and we do not have a sin nature….. because there is no such thing as a sin nature. This phrase is not in the Bible and like many of the false theological MANufactured words and phrases it is not biblical. Its only function is to condemn and be negative.
Not all MANufactured words and phrases are false. For example if I wanted to promote the phrase “Yeshua is King!” Although, it is not in the Bible and it is a correction to the English Bibles because they us the wrong name for Christ. This phrase or Christ is King, is well defined in the scriptures. So it is not wrong or a deception.
The phrase natural man is in the Bible and is more accurate and well represented in the Bible.
What was the purpose Christ’s crucifixion? Over 30,000 different Protestant denominations and many do not agree on the why of this. So, there is not going to be agreement here…..no surprise! Why? Because the Bible does not define or explain why…..very well. So what I offer is at least partially speculation, but we will start with scriptures.
Otherwise, He would have needed to suffer often since the foundation of the world; but now once at the consummation of the ages He has been manifested to put away sin by the sacrifice of Himself...Hebrews 9:26
so Christ also, having been offered once to bear the sins of many, will appear a second time for salvation without reference to sin, to those who eagerly await Him….Hebrew 9:28
“He himself bore our sins” in his body on the cross, so that we might die to sins and live for righteousness; “by his wounds you have been healed.” 1st Peter 2:24
The key points of the scriptures are underlined…..
put away sin by the sacrifice of Himself
having been offered once to bear the sins of many
He himself bore our sins
so that we might die to sins and live for righteousness
He bore our sins….Some believe this is why Yeshua said this while He was on the cross…
“ELI, ELI, LEMA SABAKTANEI?” that is, “MY GOD, MY GOD, WHY HAVE YOU FORSAKEN ME?” Being that Yahweh, God the Father, could not be with Him or maybe could not bear to look at Him.
I believe that it has a connection to Baptism. John the Baptist performed baptisms for the remission (forgiveness) of sins….Mark 1:4, Luke 3:3
In the same respect Acts 2:38 Then Peter said to them, “Repent, and let every one of you be baptized in the name of Jesus Christ for the remission (forgiveness) of sins; and you shall receive the gift of the Holy Spirit.
Therefore we have been buried with Him through baptism into death, so that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life. Romans 6:4
Still people have different beliefs on this. I believe it means that through the blood of Yeshua and His sacrificial death on the cross we share in that. So is it a metaphysical death and spiritual death and resurrection that occurs during baptism? We go down in the water as a death and are resurrected as a spiritual person with no past and no sins. God has no memory of the old person or their sins. We come out of the water with a cloak of grace that God the Father sees as pure….so be the reason the veil was torn in two….nothing to separate us from God the Father and we can then have a relationship with Him that Paul describes as the family of God.
So then He has redeemed us from that system of sin and tally that separated us from God the Father. More than just take away our sins, Yeshua broke the slate that our sins were tallied on. From that point, when we come out of the water, our sins…. our transgressions are between us and Yeshua…He is the one that sees them and He is the one that forgives them. 1st John 1:9
It is all about the sacrifice…. For it is impossible for the blood of bulls and goats to take away sins. Hebrews 19:4 The sacrifices under Law could not forgive sin, those sacrifices could only appease God and forgo the wrath of God. Yeshua was the ultimate and pure sacrifice that would put an end to the Law for those that abide in Him and it but an end to the need for sacrifices. Now we are not under the 613 Laws of the Old Testament …the Old Covenant. We have a New Covenant with God. Hebrew 8:6-7 In this New Covenant we have better promises and Yeshua has taught us better morals…..In this Covenant we will not do things like sell our daughters as sex slaves. In this Covenant we have true forgiveness and Yeshua had opened the gates of Heaven so that we can abide with God.
Then there are those that believe that God the Father punished Yeshua. That is false.
And then there is the topic of Yeshua as a God and as a man. Can we comprehend it? I am not sure. Some word it as 100% God and 100% Man.
And even one God? No chance. We know that Yeshua said that the Father was greater than He. John 14:28 And we know that Yeshua said that His Father… Yahweh …was His God. John 20:17 Matthew 27:46 We know He did the will of the Father, not His own. John 5:30 John 6:38 Separate wills, separate minds.
I would word it as Yeshua was the true Son of God both spiritually and physically. He was conceived and born of a woman and nursed by her breasts. He grew up as a man….the body of a man and the Spirit of a God. Although they killed the man, but they could not kill the Spirit of a God.
So Yeshua had all the needs and desires of a man and so He could be tempted and was tempted, but He did not give in to sin. As Yahweh said in the Old Testament….”If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must rule over it.” Genesis 4:7 In order for Yeshua to be the perfect and pure sacrifice He had to be tempted but resisted it and be without sin. The Son of God…a full-fledged God saved us.