Jesus only called one message "gospel" the kingdom of God. Mark said at the beginning of Jesus' public ministry, "Jesus came into Galilee preaching the gospel of God, saying, 'The kingdom of God is at hand. Repent and believe in the gospel.'" When demons saw the new King, they trembled and cried out, "Have you come to destroy us?" After three years of preaching His kingdom, Jesus promised, "This gospel of the kingdom will be proclaimed in all the...