You're moving in the right direction, slowly but surely. I appreciate your honest effort not to allow any belief to be undone quickly nor without consent of your own conscience.No sin nature, but only becoming sinners by nature by doing so naturally.
Whatever you do naturally is by your nature. Either sin nature, or born again divine nature.
Your first point at least agrees that only by doing, can we become naturally conformed to what we do, and not by being born with it: Adopting and adapting to a natural way of doing things.
And your third point is correct, that souls having sinned and become sinners by nature, we cannot then adopt and adapt the divine righteous nature by seeking to do so with our own will, but only by new birth of the Spirit, being born again new and clean and fresh as every babe from the womb:
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. John 1
And so, as sons of God we are to guard our purified souls and heart through obedience to the Spirit, that we may keep ourselves and our new divine nature from God, and not return to adopting and adapting to the old natural sinning of the old man.
We know that whosoever is born of God sinneth not; but he that is begotten of God keepeth himself, and that wicked one toucheth him not.
However, there is no sin nature in heaven nor in earth, but only sinners sinning like the devil, that sinned from the beginning, who was not made and created with a sin nature, neither Adam, nor any creature created by God on earth, including all babes from the womb.
You see, it's as simple as what is written and what is not: the divine nature is written, a sin nature is not, and so by Scripture we can rightly teach the divine nature, not a sin nature.
The truth of Scripture is that there is only one spiritual nature in heaven and earth, which is the divine nature of God, who creates all things for His good pleasure, not for sin but for righteousness' sake.
Jesus Christ is the Creator and Maker of all things, and He has given of His divine nature to whom He will, but He has never created nor made any creature, whether it be spirit or flesh, with a 'sin nature', and no such created being of spirit or flesh therefore can have a sin mature, which can only be by creation.
All nature is created, except the divine nature of God that is eternal.
Where therefore did a sin nature or spirit come from, if not from God? How was it created, if not by God? It is just assumed by man without Scripture, that a sin nature just 'came to pass', or 'came into being' of it's own accord.
Nothing, whether nature, spirit, principality, nor flesh comes to pass and into being, except it is created that way by God Himself Personally.
For there to be a sin nature that creatures are made and born with, then that would mean Jesus Christ, the Maker of all creatures by his light, would therefore be the Maker of sinful creatures from birth.
All things were made by him; and without him was not any thing made that was made. In him was life; and the life was the light of men.
God who is Light and in whom is no darkness at all, is the only One Creator and Maker of anything in heaven and in earth, and He has created all things, whether spirit or flesh for His good pleasure, and He has no pleasure in sin nor death:
Thou art worthy, O Lord, to receive glory and honour and power: for thou hast created all things, and for thy pleasure they are and were created.
He creates all things good in the beginning, and He has never created sin, a sin nature, nor spirit of sin.
God does not create anything that is not good in His creation, whether spirit or flesh, which included Lucifer and Adam, along with all ministering spirits and men.
The fact is, that to believe in the lie of there being a sin nature, which creatures are born with, is to believe there is another creator and maker of creatures in heaven or in earth, which includes that of souls and bodies of men.
And since it is a sin nature being created, then that would have to be the god of this world, who still so wants to be thought of and worshipped as a creator, especially the creator and maker of the sin nature, by which he makes and brings men into this world by birth to be dead in sin and enemies of God.
Since God is not a Creator of sinful beings, nor of a sin nature and spirit, and the devil is not a creator nor maker of anything, except a lie and is the father of it, then there is no created sin nature, whether of spirit or flesh.
And neither Adam nor any man, save Jesus Christ, certainly does not create his own nature, since man is a created being and not a creator himself. Neither did Jesus the God and Creator of all things create His own divine nature.
I know that this is purely 'doctrinal' with you, since you do not even believe you have a sin nature anymore, much less use it as excuse to keep on sinning, even as I.
If you have any Scripture whatsoever that says 'sin nature', as Scripture does say 'divine nature', or any creature being created and born with and partaking of a sin nature, as it speaks of partaking of the divine nature, then by all means quote it.
Or if you can see any flaw in the teaching above pertaining to Scripture quoted, then please show it.