How do we know that true faith is important for salvation?

True faith is essential for salvation because it is not merely knowing about God, but being united with Christ in a transformative relationship. This saving faith leads to justification, as articulated in Romans 5:1. Unlike the faith of demons, which leads to horror and condemnation, genuine faith brings peace and confidence, rooted in the knowledge of Christ as both Savior and Lord. It is crucial to recognize that mere belief in religious truths without the personal and transformative aspect of faith in Christ does not equate to genuine belief.