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

The necessity of Christ's sacrifice is deeply rooted in the biblical concept of justice and redemption. The original curse, pronounced after the fall, implied that disobedience not only led to physical death but also entailed spiritual separation from God, described as the 'second death' in Revelation 20:6. Jesus, as the perfect substitute, took upon Himself the full weight of divine wrath due to sin and thus provided the necessary payment required for our reconciliation with God. By pouring out His soul unto death, He not only paid the penalty but also fulfilled the promise of redemption that was given throughout the Old Testament, affirming that without the shedding of blood, there is no remission of sin (Hebrews 9:22).