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

The necessity of Jesus' sacrifice for salvation is rooted in biblical prophecy and fulfillment. Isaiah prophesied of the suffering servant (Isaiah 53), and Peter affirmed that by Christ's stripes we are healed (1 Peter 2:24). The scourging and crucifixion of Jesus, while a display of human injustice, were sovereignly ordained by God to accomplish salvation. Each stripe He bore had the name of those He would save written upon it, signifying that His suffering was substitutive and redemptive (Zechariah 13:1). God's plan necessitated that the wrath intended for us be laid upon Him, fulfilling the requirement for atonement and enabling our reconciliation with God.