How do we know that Christ's atonement is effective for us?

The effectiveness of Christ's atonement is underscored in Romans 5:9, where it states that we are justified by His blood. This justification means that, through Christ's sacrifice, we are reconciled to God, escaping the condemnation we rightfully earn as sinners. His righteousness covers us, so that God sees us not as enemies deserving punishment, but as beloved children in Christ. Consequently, our confidence in the effectiveness of Christ's atonement is anchored in the transformative relationship we have with Him, which is evidenced by the life of virtue that He instills in us through His Spirit.