It’s been said; if there is anything good in any man it is because it was put there by God. In fact, something very good… Christ’s very own “Sprit of life” (Gk. Zoë, the eternal Spirit-life), with His sinless “nature” (2Pet 1:4), has been dispensed into every genuine believer in the Lord Jesus Christ’s… flesh birth (cf. 1Jn 4:3), death, burial, and resurrection (read: 1Cor 15:1-4, Rom 10:9-10, Col 1:26-28a, 1Jn 4:13; 5:11-12).

While there is still the nature of “Sin in the flesh” of all believers (Rom 8:3b, cf. Eph. 2:1-10), there is also that new life and nature, of “the Spirit of the Lord.” Even while the fallen nature of our Sinful flesh is totally depraved, Christ’s life and nature resident within the believer’s spirit is absolutely perfect, always pleasing to the Father.

The “first man, Adam,” was created in “the image and likeness of God,” but he soon fell to the lies of Satan, the Sin-spirit. Then Adam begat children “in his own likeness, after his (fallen) image” (Gen. 5:3). Thus, being born of Adam’s lineage, the ‘Sin nature’ has passed to “all men” (cf. Rom 3:10). Fallen Adam could beget only fallen sinful offspring; and no external religious “Law,” ritual, or tradition can ever change or improve fallen man.

“… 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 condemned (Gk. katakrino, judged) Sin in the flesh ⁴that the righteousness (rightness) of the law might be fulfilled in us, who walk not after the flesh, BUT (walk) after (in accord with) the Spirit” (Rom. 8:3-4).

Adam was created in ‘the image and likeness of God,’ but soon fell to Sin. Antithetically, Jesus of Nazareth was born in the “likeness of sinful flesh” (Rom 8:3), having been being born of Mary, yet He lived unto obedience of the Cross to redeem mankind. Jesus of Nazareth was conceived of His Father by “the Holy Spirit,” while Mary gave Jesus His “likeness of Sinful Flesh.” God the Father’s life was Jesus’ life at His core, in Spirit. Jesus was made a man so He might redeem humanity from the degradation of sin, saving us 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)

“The first man Adam was made a living soul; the last Adam was made a quickening (life-giving) spirit. (1Cor 15:45)

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

It’s only through “the operation of God” (Col 2:12), in dispensing the resurrected “Spirit of life in Christ” (Rom 8:2a), that the “new creation” man (2Cor 5:17) can be brought into being. We as believers have been “regenerated (born anew)” (cf. Tit 3:5). Believers are the “new man… renewed in knowledge after the image of Him that created him” (Col. 3:10) as the “new man, which, after God is created in righteousness and true holiness” (Eph. 4:24).

Our new man has the divine life and “nature” (2Pet 1:4) of resurrected Christ as the “Seed” (Gk. sperma) of the Father, coming humanly through the line of Abraham, of whom God said his “seed” would bless all mankind.

“… in blessing I will bless thee (Abraham), and in multiplying I will multiply thy seed …¹⁸ 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)

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

John wrote to Israel of the sinless ‘spirit-nature’ within the believer’s spirit, as one who then is “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)

“… anyone born of God does not [deliberately and knowingly] practice committing sin, but the One Who was begotten of God (Christ) carefully watches over and protects him [Christ's divine presence within him preserves him against the evil], and the wicked one does not lay hold (get a grip) on him or touch [him].” (1Jn 5:18 AMPLIFIED)

Yes, we as free-will believers living in human bodies, may still occasionally be tempted and commit acts of sin. Forgetting who we now are, we may choose to not obey the inner restraint of the sinless nature of “the Spirit of Christ” within us as the new us. We then bear the consequences of our choices; hopefully we thereby learn to “walk in the Spirit.” Paul says even then… we still stand sinless in God’s sight because He is faithful to us even when we are not entirely faithful.  “(Even) If we believe not, yet he abideth faithful… (2 Tim 2:13) “Being confident… that he which hath begun a good work in you will perform it until the day of Jesus Christ:” (Philip 1:6)