Why is Christ's atonement essential for salvation?

In the sermon, it is emphasized that through the blood of Christ, all who believe are justified from all things, which they could not achieve through the law of Moses (Acts 13:39). The necessity of Christ's atonement is seen in His sacrificial role, where He bore the sins of His people. This atonement not only satisfies God's justice but also brings reconciliation between God and sinners. The righteousness of Christ is imputed to believers, allowing them to stand guiltless before God. Therefore, recognition of Christ's atoning sacrifice is crucial for understanding salvation in a Reformed context.