Many believers say they are alive to both natures; the sin nature and the Righteous born again nature. Does scripture teach this?
No.
Scriptures teach that Jesus came in a type of body as a sinful man without having received the Holy Ghost yet. Jesus was in a body of flesh as a new born baby in this world. Was it possible for Jesus to sin in His natural body and could He be affected by Satan (the worldly nature as we are) and possibly sin?
Not so.
1 Corinthians 15:45-50 (KJV)
45 And so it is written, The first man Adam was made a living soul; the last Adam
was made a quickening spirit.
46 Howbeit that
was not first which is spiritual, but that which is natural; and afterward that which is spiritual.
47 The first man
is of the earth, earthy: the second man
is the Lord from heaven.
48 As
is the earthy, such
are they also that are earthy: and as
is the heavenly, such
are they also that are heavenly.
49 And as we have borne the image of the earthy, we shall also bear the image of the heavenly.
50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
Read the whole passage. Adam was of no man before him, but from God, a spirit (in the image and likeness of God)in a natural body. When he sinned he died spiritually. He remained a natural man living with a dead spirit, with no hope. There was no savior for him, none to restore spirit life. His lonely soul occupied his natural body until dying nine centuries later.
Jesus was conceived in the woman according to God's promise to Eve. His Father was God, by the Holy Spirit. From that moment Jesus possessed the life of the Spirit, having a soul and natural body like Adam started off with. The difference between Adam and Jesus is enormous, in that Jesus didn't have that spirit curse on him, and did not sin. That qualified Jesus to be our Second Man Adam, Savior through faith in Him who alone was sinless, the sinless lamb of God reserved for the cross. Jesus carried out what Adam should have maintained, enabling him to have lived healthy all along to this day. But he alone instead bears the fault of death entering into creation.
All of us link back to the fallen man Adam. His offspring carried his curse, being dead spiritually from conception. Each of us has a dead "Old Man" in our history, an "It" that must be destroyed in our lifetime. Upon being born again by the gospel of Christ, we find spiritual life within which never existed before in us. We in a sense are set in a blessed state Adam enjoyed a little while, but forsook, that Jesus enjoyed all his days.
That life is our only hope in ridding any influence of that "It" that drives people into sin consciousness. That life of Christ in us is the power of God to overcome sin, to render that "It" we were born with, to pass from our conscience. We begin realizing the very mind of Christ, that gift given in whole at rebirth, enabling a renewal of our mind. As that proceeds we then are found less and less prone to sin, more and more living holy lives with a righteousness conscience. Our very conscience at last confirms within, needing no man to convince us we are indeed made free. The great promises are for those who overcome sin while in the natural body.
Did Jesus have two natures when He was born of Mary and of the Spirit in the flesh?
Was Jesus in the flesh and in the Spirit as born again believers are today; did he have two nature?
No. Jesus was born with God as his very father, but never had death in him, only life. He kept that life in spite of being tempted by Satan like Satan tempted the first man.
No other human can claim having been born with a live spirit like Jesus had at birth. However, the way is made for each of us to receive the life Jesus offers. That way requires a total devotion of obedience to finish in us the final product desired by God.
To infer that a Christian can copy what Jesus did concerning sinlessness from the moment of our regeneration is to insult God. None of us is suitable to hang on a cross dying for the sins of the world. Our only hope remains in trusting Jesus to be the only sacrifice, the only Lamb of God.
Get on track with 2 Peter 1, grow, pursue the mind of Christ to a perfect man well equipped. In doing so you will overcome.