How do we know faith in Christ is essential for Christians?

Galatians 2:20 illustrates that a Christian's life is not merely a series of moral endeavors but rather is a life lived by faith in the Son of God. It is through this faith that believers connect with the realities of Christ's suffering and resurrection, gaining the necessary strength to face sin and spiritual struggles. Without this understanding and reliance on Christ, efforts to resist sin are futile, akin to sowing without a harvest. As believers grasp the depth of Christ’s substitutionary work and presence in their lives, they are empowered to live righteously, reflecting the transformative power of the Gospel. Thus, faith is both a foundational belief and the dynamic force by which Christians navigate their spiritual journey.