When you sin now, it only effects the flesh, not our Spirit that is now protected by Christ Spirit, which can not sin.
The idea that we are pure spirits trapped in sinful bodies is called "gnosticism." It is an ancient heresy.
Sin is sin because it adheres to our souls, changing our very being.
You seem to be considering your flesh as the heart of a person, but its simply a covering that will be discarded when you die, and it’s what pleasures in sin in us now. When your sinful flesh dies, it’ll have no effect on your spirit that Christ has indwelled in you.
Human beings are body and soul united. We expect a new body at the Resurrection. We sin because of who we are, nto because we happen to be saddled with a dirty body, from which we need liberated.
SD
Yep, I agree.
I'll further agree that the logic of orthodox Christian doctrine requires Jesus to be fully human. If he was another, separate creation, his sacrifice would not be redemptive of fallen humanity.
For as by a man came death, by a man has come also the resurrection of the dead. (1 Corinthians 15:21)