How do we know Christ's substitutionary atonement is true?

The doctrine of substitutionary atonement finds strong support in the scriptures, particularly in the prophetic words of Caiaphas, as recorded in John 11:49-52. His statement is not merely his own opinion but a prophetic revelation of Christ's impending sacrifice for the nation. Additionally, Romans 3:23-26 elaborates on how God set forth Christ as the propitiation for sin, demonstrating that through faith in His blood, God is both just and the justifier of those who believe in Jesus. This tightly weaves together the Old Testament foreshadowing and New Testament fulfillment of Christ's atoning work.