How do we know the gospel we believe is the true gospel?

To determine if our gospel is indeed the gospel, we must evaluate it against several criteria. Firstly, does it correspond with the Old Testament Scriptures which point to Christ? Secondly, does it attribute all glory to God for salvation rather than relying on human effort or decision? Furthermore, a true gospel must place Christ at its center, affirm the sovereignty of God, honor His law, and address sinners at their point of need. If it fulfills these aspects, it aligns with the gospel of God.