It depends on what you mean by "incomplete." Reconciliation isn’t one‑sided. Scripture describes a real conflict between God and humanity: God is rightly offended by sin, and humans are stubbornly resistant to Him. So if reconciliation is going to be complete, it has to deal with both sides of that hostility. On God’s side, His righteous anger must be satisfied — that’s atonement or propitiation. On our side, we must actually turn back to Him — that’s repentance and faith. Put simply, God must be appeased, and man must be changed. Without both, the relationship isn’t truly restored.
In Colossians 1:20–22 Paul shows that reconciliation has to deal with both sides of the conflict. On God’s side, His holy wrath against sin must be answered — that’s why Paul says peace comes “through the blood of His cross.” On our side, we are the ones who were “alienated and hostile in mind,” so reconciliation also requires that we be changed, brought back, and made holy. Paul’s point is that Christ’s death satisfies God’s righteous opposition to sin, and Christ’s resurrection life transforms our hostile hearts. Only when both God’s wrath is appeased and our hostility is surrendered is the relationship truly restored.