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

The effectiveness of Christ's atoning sacrifice hinges on His sinless nature and the fulfillment of Old Testament types and prophecies. Isaiah 53:6 underscores this by stating, 'the Lord hath laid on him the iniquity of us all,' illustrating that Christ bore the sins of His people. Additionally, John 18:12 depicts His voluntary submission to being bound and led away, fulfilling the prophecies regarding His suffering. This points to the ultimate reality that Christ, being blameless and perfect, fully meets the requirements of God's justice, allowing Him to be the perfect substitute for sinners. Thus, His sacrifice not only satisfies the wrath of God but also secures salvation for all whom the Father has given to Him.