In Romans 4:13 the Apostle Paul interprets a key event which happened in the book of Genesis when he says "For the promise to Abraham and his offspring that he would be heir of the world did not come through the law but through the righteousness of faith." [emphasis mine] Therefore God's covenant promises to Abraham were not limited to one single spot of land over in the Middle East but the entire world! I would go so far as to say the entire universe or the created realm was promised to Abraham and his Offspring. And who is Abraham's Offspring anyway? It is none other than Christ himself. Paul explains this clearly in Galatians 3:16 "Now the promises were made to Abraham and to his offspring. It does not say, “And to offsprings,” referring to many, but referring to one, “And to your offspring,” who is Christ." So Jesus is not only the Offspring of Abraham, which would make Him the True Israel but He is also the New Adam, the New Moses and the New Temple. In other words, there has been a whole New Creation afoot and it has been spreading sense the time of Jesus! The coming of the Son of God into the world as the long promised Messiah and the ascension of the Son of Man to be seated at the right hand of the Father not only fulfilled the promises made to Abraham but also inaugurated the Kingdom of God and the eternal covenant.
Christ's Kingdom is ruled and reigned by Him from His glorious throne in heaven. It is the impetus for His kingdom on earth. All authority in heaven and earth has been given to Him. Jesus taught us to pray like this: "your Kingdom come...your will be done..., where? "on earth as it is in heaven!" The driving force or the stimulus of the transformation of this lowly place or earthly kingdom is the heavenly kingdom in other words the New Jerusalem or Zion. In principle, the Kingdom is already here and has been here for 2000 years but the application of redemption is not just for individuals but has implications for the entire world; Christ came to be the Savior of the world! His Kingdom is spreading and cannot be stopped. The gates of hell shall not prevail against it!
