I am amazed that when I point out the obvious difference between the Gospel of the Kingdom and the Gospel of Grace, they get all befuddled and even defensive. Why? It is so obvious! 1 Corinthians 15:1-4 tells us that the Gospel that saves us is a belief in the death, burial, and resurrection of Christ. This could not have been taught in the Gospels because it had not happened yet. What is so hard to understand about that? Again, what was bad news to the Jew was good news to the Gentile. Romans 1:16 tells us that it is obtained simply by faith/belief with no works required. 1 Corinthians 1:18 tells us that that faith is in the completed work of Christ on the cross. Also, compare 1 Corinthians 1:23-24. Furthermore, Ephesians 2:1, 2:8-10, 11-13 tells us that no works are necessary under the Gospel of Grace at all. Only belief. That is the Gospel that Paul referred to in 1 Corinthians 15:1-4.