How do we know the believer's gospel is God's gospel?

To discern whether our gospel aligns with God's, we must examine its characteristics as laid out in Paul's writings. First, it must be the gospel of grace—strongly affirming that salvation is a divine gift, not earned through human effort. Moreover, it must honor Christ as the focal point of redemption, emphasizing that the gospel is not about our actions but rather about Jesus' life, death, and resurrection. It must also be supported by the entirety of scripture, showing a consistent narrative that reveals God's purpose for salvation. Lastly, the gospel must be revealed by God, as understanding it requires divine illumination. Each of these elements confirms the authenticity of the gospel with respect to the biblical witness.