God's plan was implemented via Israel. Paul reminds "that you were at that time separate from Christ, excluded from the commonwealth of Israel, and strangers to the covenants of promise, having no hope and without God in the world" (Eph 2:12). "God was in Christ reconciling the world to himself" (2Co 5:19). His purpose was "through Him to reconcile all things to Himself, having made peace through the blood of His cross" (Col 1:20) which "put to death the enmity" (Eph 2:16). "He as now reconciled you in His fleshly body through death, in order to present you before Him holy and blameless and beyond reproach" (Col 1:22). He reconciled "both [Jew and Gentile] in one body to God through the cross" (Eph 2:16). Paul encourages "on behalf of Christ, to be reconciled to God" (2Co 5:20). "Having been reconciled, we shall be saved by His life" (Ro 5:10).
Since man couldn't help himself God decided to solve the problem. "God so loved the world, that He gave His only begotten Son" (Jn 3:16) as a propitiation. He was "revealed" (1Ti 3:16) and sent "in the likeness of sinful flesh" (Ro 8:3), "has come in the flesh" (1Jn 4:2), and was made "in the likeness of men" (Php 2:7) as a "descendant of David" (Ro 1:3). This was to demonstrate His righteousness" (Ro 3:24-25). John saw the "Lamb of God who takes away the sin of the world!" (Jn 1:29). Jesus "will save His people from their sins" (Mt 1:21). Your sins will be "wiped away" (Ac 3:19). How is this accomplished? It is because "Christ died for our sins" (1Co 15:3). He "was delivered over because of our transgressions, and was raised because of our justification" (Ro 4:25). God "made Him who knew no sin to be sin on our behalf" (2Co 5:21) and he was "offered once to bear the sins of many" (Heb 9:28). "He died to sin once for all" (Ro 6:10) and "condemned sin in the flesh" (8:3). Jesus said "'I DESIRE COMPASSION, AND NOT SACRIFICE', for I did not come to call the righteous, but sinners" (Mt 9:13). Christ gave "His life a ransom for many" (Mt 20:28) and therefore "in Him we have redemption through His blood" (Eph 1:7). You believe that he is the "propitiation for our sins" (1Jn 2:2). Therefore "consider yourselves to be dead to sin, but alive to God in Christ Jesus" (6:11). We are "always carrying about in the body the dying of Jesus so that the life of Jesus also may be manifested in our body" (2Co 4:10). Because of what Christ accomplished "the life which I now live in the flesh I live by faith in the Son of God" (Gal 2:20). Paul said "I have been crucified with Christ; and it is no longer I who live, but Christ in me" (:20). "Christ is in you, though the body is dead because of sin, yet the spirit is alive because of righteousness" (Ro 8:10).