How do we know Christ's atoning death is effective?

The efficacy of Christ's atonement is grounded in the sovereign purpose of God. According to 2 Corinthians 5:21, He was made to be sin for us, fulfilling all the demands of justice on our behalf. Isaiah 53:10 reveals that it pleased the Lord to bruise Him, indicating that His sacrifice was divinely ordained and entirely satisfactory for the redemption of the elect. Thus, understanding and accepting the doctrine of Christ's atoning death is crucial for true faith, as it secures not just the possibility of salvation but guarantees it for those chosen by God.