Why is Christ's death considered essential for salvation?

In sovereign grace theology, the death of Christ is central to the doctrine of salvation. His death acts as the fulfillment of God's plan for atonement, affirming the covenant of grace made between God and His people. As highlighted in Hebrews 9:15, Christ's death opens the way for His elect to inherit the promises of eternal life. This sacrificial act not only confirms the blessings of the New Covenant but also brings about redemption, allowing sinners to be reconciled to God through faith in Christ. Therefore, His death is not merely historical; it is the foundation upon which salvation rests.