Why is Christ's atonement important for believers?

Christ's atonement serves as the foundation of the believer's justification and acceptance before God. Through His substitutionary death, Christ bore the penalty for sin, achieving redemption from the curse of the law as stated in Galatians 3:13. His death not only satisfies God’s justice but also provides a perfect righteousness through which believers are declared righteous in His sight. The atonement signifies that believers' sins are paid for and removed, granting them peace with God, as discussed in Romans 5:1, allowing a restored relationship with their Creator.