As Jesus is the cornerstone upon which the Church is built, so are his teachings the unifying cornerstone of Christian doctrine.
The tribute coin of Matthew 22:20 was probably one labeled with abbreviations meaning “Tiberius Caesar, Divine Augustus Son of Augustus.” It could have also been an earlier coin with the inscription “Caesar Augustus son of divinity, Father of his Country.” Either coin makes claims which were blasphemous to the Jews. Such actions by the Romans gave rise to tax revolts such as those led by Jewish Zealots. Jesus was a different revolutionary. His agenda was certainly political, the kingdom of heaven, but the kingdom of heaven would conquer the kingdoms of this world by different means. So when Jesus said to render to Caesar the things that belong to Caesar he was not capitulating to this world’s governments, but subverting them by submission to the point of death. That revolution continues today in the hearts of all who believe.