How do we know the gospel is the true message of salvation?

The Apostle Paul emphasizes that the true gospel is the good news of salvation entirely through Jesus Christ. In Galatians 1, Paul warns against perverting the gospel, highlighting that any message attributing salvation to human action falls short of God's grace. The true gospel centers on Christ’s deity, His redemptive work, and the righteousness of God made manifest. This singular focus on Christ ensures that salvation is not dependent on our efforts, reinforcing the core tenet of sovereign grace theology.