If He is... He is doing a very, very poor job of it!
Look around... nations all over this world are running amuck so your comment is not true.
There will be a 1000 Year Reign where Jesus Christ will literally be King over all the earth and there will be no more war, sickness, disease, hunger, etc,etc.
The reign of Christ was
a present reality in Paul’s day. The prophets had described how Christ’s reign would begin. Daniel, more than 500 years before Christ was born, saw a clear vision of the future Messiah:
“one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him. And there was given him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed” (
Daniel 7:13–14).
The Messianic "1,000 year" (which simply means "long period of time") reign would begin after Jesus ascended in clouds to heaven in 30 AD. It doesn't begin thousands of years later when He returns to earth. This idea of a literal, physical earthly reign in some future temple is nonsense, an invention of those who developed the idea because they didn't understand the spiritual nature and immediate nature of the Kingdom.
Paul and the other apostles spoke of Christ’s kingdom as a reality in their day. Peter spoke of the fulfillment of God’s thousand-year-old promise to David: God
“would raise up Christ to sit on his throne.” God had fulfilled that promise in the resurrection of Christ (Acts 2:30–31).
Stephen saw Christ standing at the right hand of God. The establishment of Christ’s reign through his death, burial, resurrection, and ascension is a fundamental and necessary element in the gospel of the kingdom. So many Christians continue to wait for the Kingdom to be established in a physical way not realizing we are ALREADY a part of the spiritual kingdom that will never be destroyed. We are already "singular stones" making up the spiritual temple with Christ as our Chief Cornerstone.
First understand the purpose of His reign. Christ is on the throne, right now!! Christ is reigning in order to “
put all enemies under his feet.” Christ and his kingdom are, in our day, at (spiritual) war with the gods of this world. The gospel declares that the kingdom will successfully overcome them all—with an important caveat—
during the Messianic age. As I pointed out, the Mosaic Age ended in 70 AD, 40 years after the Cross.
We need to understand the progressive nature of the kingdom’s conquest. The kingdom would not overcome its enemies all at once through some catastrophic event. The New Testament also teaches, as we would expect, this gradual increase of kingdom power and influence. The small kingdom mustard seed grows over time to become a large tree (
Matthew 13:31–32). Kingdom leaven progressively exerts its influence until the whole lump is leavened (
Matthew 13:33). Now that it is established, Christ’s kingdom will grow, fill the earth, and overcome its enemies in the process.
I hope this helps and blesses those who read this.