“I take issue with the premise that we can create a Heaven on Earth without the direct intervention of Jesus.”
Wow, go back and watch the video again. He never asserts that we can create Heaven on earth “without Jesus”. First off, the Holy Spirit is in believers so in a sense God is here on earth. The speakers only assertion is that we are commanded to go out and be salt and light and change the world around us.
Because we are commanded to.
Too many Christians sit around and wait for the rapture and don’t get involved in politics or charity because “Jesus is coming back soon anyway”.
But even the futurist millennium is not heaven on earth, even with your claim of direct intervention by Jesus. There is still death and sin in the millennium. And a significant rebellion at the end, when the nations whose number is as the sand of the sea go up against the camp of the saints.
Heaven on earth does not come until the new heavens and new earth.
Of course the Scripture teaches that this comes about at the day of the Lord who comes as a thief to redo creation.
But the day of the Lord will come as a thief in the night, in which the heavens will pass away with a great noise, and the elements will melt with fervent heat; both the earth and the works that are in it will be burned up. (2 Peter 3:10)