Trying to understand Dispensationalism

[TomL]

Amen. Jesus was given a kingdom called the Kingdom of God, which consists of all peoples, nations, and languages who have become His disciples, and that kingdom is an everlasting dominion, which shall not pass away, and His kingdom is one that shall not be destroyed. So, we cannot suppose that He will accept a demotion to become a king here on earth in Jerusalem. This earth WILL pass away, so why would Jesus accept an earthly kingdom, when this earth will be burned up? His throne for this kingdom is in heaven and He will never abdicate that throne. He said, "My kingdom is not of this world.", so why do "dispensationalists" say that it is?

Ephesians 1:19–23 (ESV) — 19 and what is the immeasurable greatness of his power toward us who believe, according to the working of his great might 20 that he worked in Christ when he raised him from the dead and seated him at his right hand in the heavenly places, 21 far above all rule and authority and power and dominion, and above every name that is named, not only in this age but also in the one to come. 22 And he put all things under his feet and gave him as head over all things to the church, 23 which is his body, the fullness of him who fills all in all.