I do not know where you learned your theology, but I do know that it was not from the Bible. I am not saying that to be argumenitive with you, just makeing an observation.
Romans 8:3–4 says,
“For what the law was powerless to do because it was weakened by the flesh, God did by sending his own Son in the likeness of sinful flesh to be a sin offering. And so he condemned sin in the flesh, in order that the righteous requirement of the law might be fully met in us, who do not live according to the flesh but according to the Spirit.”
When the Bible refers to “the flesh” it usually means the human
tendency to sin that we all inherited from Adam. When Adam and Eve chose to rebel against God’s commandment, they became “sinful flesh.”
At that moment, sin entered God’s perfect world and began to corrupt everything. Since every human being came from Adam, we have all inherited his fallen nature. So every person is born as a sinner.
Jesus did not have an earthly father, so He did not inherit a sin nature as all other human beings do. He took on human flesh, yet He retained His full divinity. He lived the life we live, suffered as we suffer, and learned and grew as we learn and grow, but He did it all without sin. Because God was His Father, He lived only in the
likeness of sinful flesh. Jesus inherited the flesh from His mother, Mary, but not the sin from Joseph.
Jesus became man in order to be our substitute.
Yes, I agree that sin is sin but you must also realize that all moral law begins with God. Because we were created in the image of God, we have His moral law written within our hearts.