How do we know that salvation is through faith in Christ and not by the law?

The truth of salvation through faith in Christ is grounded in Scripture. For instance, Romans 3:21-22 states, 'But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets; even the righteousness of God, which is by faith of Jesus Christ, unto all and upon all them that believe.' This reveals that the righteousness required for salvation cannot be obtained by following the law, as all have sinned (Romans 3:23). Instead, justification is given freely by God's grace through faith in Jesus Christ, who is the propitiation for our sins (Romans 3:25). This underscores the necessity of relying on Christ's work and not our own efforts under the law.