How do we know Christ was our substitute on the cross?

The doctrine of substitutionary atonement is clearly evidenced in Christ's cry and the fulfillment of prophetic scripture. Jesus' utterance, 'My God, my God, why have You forsaken me?' reveals the deep spiritual reality of His substitution on behalf of sinners, showing that He bore the vast weight of the world's transgressions (Isaiah 53:5-6). This moment was not simply about His physical suffering but highlighted the divine exchange occurring, where Jesus took upon Himself the punishment that we deserved.

In addition, the historical understanding of Jesus’ purpose as the Lamb of God, as foretold by the Old Testament prophets, provides further assurance of His substitutionary role. His willingness to accept the full brunt of God’s righteous anger against sin illustrates the profound mystery of the Gospel—that the eternal Son of God became sin for us. This perspective shapes the believer's understanding of grace and motivates a response of faith and gratitude towards Christ's immense sacrifice.