How do we know the Gospel of substitution is true?

The Gospel of substitution is grounded in the fulfilled promises and purposes of God. The account of Abraham’s willingness to sacrifice Isaac serves as an archetype for Christ’s sacrifice, pointing to God’s predetermined plan for redemption, which was established from before the foundation of the world. In both the Old and New Testaments, we see God's sovereignty and the unchanging nature of His promises. As the narrative unfolds, it becomes evident that God not only commanded sacrifices but also ultimately provided His own Son, affirming the truth of substitutionary atonement. Throughout biblical history, God reveals His character and the reality of His redemptive plan, culminating in Jesus's atoning death—a demonstration of His love and commitment to save His people.