Why do Christians declare they are justified by faith?

Justification by faith is a foundational truth within Reformed theology, rooted in passages like Romans 3:28 which states, 'For we hold that one is justified by faith apart from works of the law.' Justification refers to being declared righteous before God, and for Christians, this is accomplished solely through faith in Jesus Christ, rather than through any personal merit or adherence to the law.

This understanding reflects the grace of God and highlights the believer's reliance on Christ’s finished work for salvation. In Christ, all the demands of the law are met, and the believer's faith in Him is credited as righteousness. This doctrine emphasizes the security and assurance believers have in their relationship with God, knowing that their standing is based on Christ's righteousness, not their own.