Why is belief in the finished work of Christ important for Christians?

Believing in the finished work of Christ is crucial for Christians because it provides assurance of salvation and freedom from the burden of trying to earn one's righteousness. As emphasized in the sermon, our justification is based solely on Christ's completed work, not on our personal efforts or righteousness. This radical grace means that believers can have confidence in their standing before God, as Romans 8:1 declares that there is no condemnation for those who are in Christ. The peace and joy that stem from this truth allow Christians to rest easy in God’s love and grace, finding their identity in Christ alone.