How do we know that Jesus' sacrifice was necessary for salvation?

The New Testament clearly indicates that Jesus' sacrificial death was essential for our redemption. Hebrews 9:22 states, 'without the shedding of blood there is no remission of sins,' showing that the atonement required a perfect sacrifice. Jesus, being both fully God and fully man, fulfilled the requirements of divine justice through His bloody death. John Newton expounds that the law's demands against transgressors were satisfied in Christ, who died in our place as our surety. His death reconciled us to God and paid the penalty for our sins, thus demonstrating the immense love and grace of God towards undeserving sinners.