It has been well said that if there is anything good in any man it is because it was put there by God. And something very good — a new life, having a sinless nature — has been imparted and dispensed by God to every genuine believer in the Savior, the Lord Jesus Christ.

So, while there is still within us that which is of “Sin in the flesh” (Rom 8:3b) there is also that new life begotten of “the Spirit. Just as the fallen nature of the flesh is totally depraved and “cannot please God,” the other, Christ’s life and nature within us, is absolutely perfect and always pleases the Father.

Adam was originally created in “the image and likeness of God,” but he fell to sin and later “begat a son in his own likeness, after his (fallen) image” (Gen. 5:3). That ‘Sin nature’ was passed to all men, being born of Adam’s lineage. It could not be otherwise. Fallen Adam could generate and beget only fallen, sinful offspring, whom even “the Law” could not change. But

“… what the law could not do, in that it was weak through the flesh, God, sending His own Son in the likeness of sinful flesh, and for sin” accomplished, so “that the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit” (Rom. 8:3-4).

As Adam was made in “the image and likeness” of God, but fell, Christ was made in the “likeness of sinful flesh” (Rom 8:3-4) that He received by being born of Mary, but unto obedience of the cross. Jesus of Nazareth was conceived by His Father, by “the Holy Spirit of God.” Thus Mary was Jesus’ mother, on His human side, but God (not Joseph) was His Father with whom He was One at His core – in His Spirit. He was made human that He might redeem humanity from the degradation of sin and save man from the just “wrath of God.”

“For he (God the Father) hath made him (Jesus of Nazareth) to be sin for us, who knew (Gk. ginosko, experienced) no sin; (so) that we might be made the righteousness of God in him.” (2 Corinthians 5:21)

“Much more then, being now justified by his blood, we shall be saved from wrath through him. (Rom 5:9)

It is only through the operation of the resurrected “Spirit of life in Christ,” that the ‘new creation human’ can be brought into being. We as believers have been made “regenerated” (Tit 3:5) or born anew, and we are of a “new man… renewed in knowledge after the image of Him that created him” (Col. 3:10) as a “new man, which, after God is created in righteousness and true holiness” (Eph. 4:24).

The ‘new man’ has the very ‘nature’ of Christ as the “Seed” (Gk. sperma) of God the Father that came humanly through the lineage of Abraham, of whom God said his “seed” would bless the world of mankind.

“… in blessing I will bless thee (Abraham), and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; ¹⁸ And in thy seed (posterity) shall all the nations (Heb, goy, Gentiles) of the earth be blessed; because thou hast obeyed my voice.” (Gen 22:17-18)

“Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.” (Galatians 3:16)
“Being born again, not of corruptible seed, but of incorruptible, by the word (Christ is the Word, Jn 1:1) of God, which liveth and abideth forever.” (1 Peter 1:23)

“Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. (2 Corinthians 5:17)  

John wrote to Israel of the new sinless ‘spirit-nature’ within the believer’s spirit after being “born of God.”

“Whosoever is born of God doth not commit sin; for his (God’s) seed (Grk. sperma) remaineth in him: and he cannot sin, because he is born of God.” (1 John 3:9)
“We know that whosoever is born (procreated, recreated) of God sinneth not; but he that is begotten (begat) of God keepeth himself, and that wicked one toucheth (Gk. haptomai, attaches to) him not.” (1 John 5:18)

Yes, we as humans in human bodies may still occasionally be tempted to commit acts of sin. We, still as free-will creatures, and we may forget who we are, wrongly choosing not to obey the sense of our new sinless nature that we have of “the Spirit of Christ” within us. Thus bear the consequences of our foolish choice, and hopefully learn who we really are in Christ as Christ persons. Regardless, Paul says… we stand sinless in God’s sight because He is faithful to us even when we are not entirely faithful.

2 Timothy 2:13 If (even when) we believe not, yet he abideth faithful: he cannot deny himself.