How do we know that substitutionary atonement is true?

The truth of substitutionary atonement is grounded in various scriptural teachings and examples throughout the Bible. The narrative of Abraham and Isaac demonstrates a precursor to God's ultimate provision of Jesus Christ as the sacrificial Lamb needed for atonement. Abraham's declaration that 'God will provide Himself a lamb' (Genesis 22:8) not only reflects his trust in God's promise but also points towards the reality of Christ's coming as the ultimate substitution for sinners. Additionally, passages throughout the New Testament, such as John 1:29, affirm Jesus as 'the Lamb of God who takes away the sin of the world.' This consistent thread across both the Old and New Testaments serves to reinforce the truth of substitutionary atonement as a central tenet of Christian faith.