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Atonement

Paul taught that Christians are redeemed from sin by Jesus' death and resurrection. His death was an expiation as well as a propitiation, and by Christ's blood peace is made between God and man. By grace, through faith, a Christian shares in Jesus' death and in his victory over death, gaining as a free gift a new, justified status of sonship.

According to Krister Stendahl, the main concern of Paul's writings on Jesus' role, and salvation by faith, is not the individual conscience of human sinners, and their doubts about being chosen by God or not, but the problem of the inclusion of gentile (Greek) Torah observers into God's covenant. "Dying for our sins" refers to the problem of gentile Torah-observers, who, despite their faithfulness, cannot fully observe commandments, including circumcision, and are therefore 'sinners', excluded from God's covenant. Jesus' death and resurrection solved this problem of the exclusion of the gentiles from God's covenant, as indicated by Romans 3:21–26.

Paul's conversion fundamentally changed his basic beliefs regarding God's covenant and the inclusion of Gentiles into this covenant. Paul believed Jesus' death was a voluntary sacrifice, that reconciled sinners with God. The law only reveals the extent of people's enslavement to the power of sin—a power that must be broken by Christ. Before his conversion Paul believed Gentiles were outside the covenant that God made with Israel; after his conversion, he believed Gentiles and Jews were united as the people of God in Christ. Before his conversion he believed circumcision was the rite through which males became part of Israel, an exclusive community of God's chosen people; after his conversion he believed that neither circumcision nor uncircumcision means anything, but that the new creation is what counts in the sight of God, and that this new creation is a work of Christ in the life of believers, making them part of the church, an inclusive community of Jews and Gentiles reconciled with God through faith.

According to E. P. Sanders, who initiated the New Perspective on Paul with his 1977 publication Paul and Palestinian Judaism, Paul saw the faithful redeemed by participation in Jesus' death and rising. Though "Jesus' death substituted for that of others and thereby freed believers from sin and guilt", a metaphor derived from "ancient sacrificial theology," the essence of Paul's writing is not in the "legal terms" regarding the expiation of sin, but the act of "participation in Christ through dying and rising with him." According to Sanders, "those who are baptized into Christ are baptized into his death, and thus they escape the power of sin he died so that the believers may die with him and consequently live with him." By this participation in Christ's death and rising, "one receives forgiveness for past offences, is liberated from the powers of sin, and receives the Spirit."