What does the Bible say about Christ's death in vain?

In Galatians 2:21, Paul asserts, 'I do not frustrate the grace of God. For if righteousness come by the law, then Christ is dead in vain.' This profound statement emphasizes that salvation cannot be achieved through our adherence to the law. If one believes they can earn righteousness through their works or the law, it negates the value of Christ's sacrificial death. Throughout Scripture, the necessity of Christ’s atoning sacrifice is reaffirmed, underscoring that He fulfilled all righteousness required for salvation. The implication is clear: if we attempt to gain favor with God through our efforts, we nullify the grace that God has extended to sinners, and thus we render Christ’s death without purpose, fundamentally disregarding His work.