Ken, Revelation 20 doesn't prove premillenialism, it only gives the duration of the kingdom.
Thank you for pointing out that you are a gnostic with your spiritual=not of this earth while evil/materialistic/carnal=after this earth.
The body and resurrection of Christ smacks your theology around Ken. Christ's body and resurrection were both spiritual and earthly/physical. Our resurrection will be wholistic. That is, all of our being will be resurrected into one body. Our immaterial and material aspects of who we are will be united in perfection.
This is the same as the kingdom. Note that in Romans 8 Paul looks forward to not only our glorification, but states that creation is awaiting its glorification. This is a day coming Ken. You get it? THE CREATION AWAITS ITS RESTORATION. That means an earthly restoration.
There is so much more to eschatology than the end of all things. Christ's kingdom is here in the present, but will also have an aspect that will complete God's wholistic pattern.
This is what John envisioned. Christ will return with his kingdom and establish it upon the earth. Remember the prophecy of Daniel in chapter 2? The stone that was cut off without hands (the cross) then shatters the kingdoms of the earth and replaces them? Christ will bring his kingdom to the earth through a cataclysmic event.
Sorry Ken, I have no desire for materialism. However, all of creation has awaited the restoration since Adam took the fruit.
Consider Matthew 19:28
And Jesus said to them, "Truly I say to you, that you who have followed Me, in the regeneration when the Son of Man will sit on His glorious throne, you also shall sit upon twelve thrones, judging the twelve tribes of Israel.
Note that Christ, with the kingdom already present, looks forward to a day (in the regeneration he says), when he will sit on his throne and the apostles will also sit on thrones as rulers.
When did the regeneration take place Ken? Paul was still looking for it when he wrote Romans. Creation is still decaying.
Back off Ken, this is a discussion you are obviously in over your head on.