The Gospel in Greek simply means “Good News”. In the 15th century the gospel was typically referred to when a General would announce to his country or province that a war or battle had been won and that they were proclaiming victory.
The Gospel of Jesus Christ is different in that it does not proclaim victory over sin for one country or province, but it is the “Good News” that Jesus Christ died for ALL sin.
Romans 3:21-26, “But now apart from the law the righteousness of God has been made known, to which the Law and the Prophets testify. 22 This righteousness is given through faith in Jesus Christ to all who believe. There is no difference between Jew and Gentile, 23 for all have sinned and fall short of the glory of God, 24 and all are justified freely by his grace through the redemption that came by Christ Jesus. 25 God presented Christ as a sacrifice of atonement, through the shedding of his blood—to be received by faith. He did this to demonstrate his righteousness, because in his forbearance he had left the sins committed beforehand unpunished— 26 he did it to demonstrate his righteousness at the present time, so as to be just and the one who justifies those who have faith in Jesus.”
The “Good News” is that Jesus Christ took ALL the punishment for the sins of ALL including yours and mine. The Apostle Paul points this out clearly in this passage of scripture that Jesus Christ is the atonement for ALL sin and those that receive it by faith receive the righteousness of Jesus Christ as their salvation.
Imagine this with me. You and I are in a courtroom and the judge asks us to present our defense as to how and why we are worthy to enter Heaven when we die? Our defense needs to be a two-word answer ……… Jesus Christ because our personal faith in Him is the only reason that any of us will enter Heaven.