How do we know Christ's death was necessary for our salvation?

The necessity of Christ's death lies in its dual role of satisfying God's justice and extending His mercy to sinners. In Galatians 3:10-14, the Apostle Paul emphasizes that all are under the curse of the law, but Christ became a curse for us by being crucified, thereby redeeming His people from the curse. This judicial act was ordained from before creation, where Christ is referred to as the 'Lamb slain from the foundation of the world' (Revelation 13:8). The cross serves as the pivotal point where God's holiness and love converge, allowing Him to be just while justifying those who believe (Romans 3:26). Thus, without His sacrificial death, the reconciliation of man to God would be utterly impossible.