So far, so good
False conclusion. I already stated previously that human nature is not sinful in itself, but here you appear to not make any distinction between human nature and sinful nature. I disagree with you. Adam incurred the sinful nature when he sinned, and it was "spread to all men," IOW, all Adam's posterity inherited the sinful nature, which is corrupted human nature. But Jesus did not have a corrupted human nature. His human nature was like Adam's before his fall, because Jesus did not have a human father.
Incorrect logic, since Jesus is the son of God, not the son of a man.
More illogic, since Jesus said "if the Son sets you free, you shall be free indeed." Heb. 12:23 says "spirits of righteous men made perfect" - so what is saved as a past event is the spirit of man. The fact that unregenerate man lacks the indwelling Holy Spirit is what makes his spirit corrupt. Therefore, the sinful nature is rooted in the spirit, and manifested in the flesh. The fact that our minds must be transformed (Rom. 12:1-2) shows that sin is indeed in the flesh and the fleshly mind, but this is said to Christians after their spirits have been freed from sin (i.e. the sinful nature).
I disagree that the root cause of a Christian sinning is that he is forced to live in a fallen world. It seems to me this is just an excuse to commit sins. The fallen world we live in is an obstacle to righteous behavior, so that challenges us to live by faith. How can faith be manifested unless there is an obstacle to it? In the same way, it is in crisis that love shines the most. It is in the face of evil that faith shines the most. We are overcomers by faith (1 John 5:4). This means that the indwelling Spirit sets us free from the root cause of sin which is a spiritual problem. So what we have to deal with after conversion is trusting God to heal us from our sinful habits, which is the progressive sanctification of the soul.
Some of your conclusions are wrong, as I have detailed above.
But now I understand where you're coming from. I do not believe in some of the Orthodox doctrines because I deem them to be unbiblical. I don't take any stock in doctrines that are made up by Christians in the past, that they have invented based on their experiences or interpretations. I believe in what the Bible says, not what some monk wrote hundreds of years ago.
So if you can't agree with the responses I wrote, then I'll be done with this conversation.