Why should Christians confess their sins if they are already forgiven?

Christians are called to confess their sins not to regain forgiveness—since Christ's sacrifice is sufficient—but to maintain a healthy relationship with God. 1 John 1:9 reminds us, 'If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.' This act of confession demonstrates our awareness of our continual reliance on God's grace and mercy. It nurtures humility, recognizing that while we are justified and forgiven in Christ, we still struggle with sin in our mortal existence.