How do we know the doctrine of salvation through Christ is true?

The doctrine of salvation through faith in Jesus Christ is underpinned by scripture and God's unwavering promises. In Zechariah 13:1, the opening of a fountain for sin signifies not just a future hope but a present reality for believers. This is confirmed in the New Testament, where Jesus expresses the necessity of His death for the forgiveness of sins (Luke 24:47). The resurrection of Christ further assures us of the truth of this doctrine, as He conquers sin and death, providing a concrete basis for our faith. Historic Reformed theology insists that faith in Christ alone, through grace alone, is central to our understanding of God's saving work.