How do we know Christ's crucifixion is essential for salvation?

The necessity of Christ's crucifixion is rooted in the doctrine of substitution, where Jesus, the perfect Lamb of God, dies in the place of sinners to satisfy the wrath of God against sin. As stated in Hebrews 10:4, the blood of animal sacrifices could not take away sins, indicating the need for a perfect sacrifice. Christ's death on the cross was not merely a tragic event; it was the culmination of God's redemptive plan, prophesied throughout Scripture. His crucifixion provides not only atonement for sin but also reconciliation between God and man. His blood is indispensable for forgiveness, as emphasized in Ephesians 1:7, showcasing that salvation is through His blood, which is the basis for our redemption and eternal life.