How do we know Christ's preeminence in salvation is true?

The preeminence of Christ in salvation is a foundational doctrine of the Christian faith, affirmed throughout the New Testament. Scripture clearly teaches that all parts of our salvation—justification, sanctification, and ultimate glorification—are rooted in Christ's finished work on the cross. Passages like Ephesians 2:8-9 emphasize that salvation is by grace through faith and not of ourselves, highlighting that it is the gift of God. Moreover, Romans 8 reveals that it is God who justifies, showcasing that our standing before God is based solely on Christ's merits rather than our works or efforts. The reality of our union with Christ further illustrates this truth, as demonstrated in Colossians 2, wherein the believer's life and righteousness are entirely derived from Him.