Are you now saying that the bride of Christ has come down out of Heaven, as the New Jerusalem is described in Revelation?
Well, let's just skip that for now. I'd prefer to address your claim that we're living in the Millennium since that is clearly rebutted. Here's a passage from scripture (Revelation 20) that describes it. See if you can agree that it describes our current time:
20 And I saw an angel coming down out of heaven, having the key to the Abyss and holding in his hand a great chain. 2 He seized the dragon, that ancient serpent, who is the devil, or Satan, and bound him for a thousand years. 3 He threw him into the Abyss, and locked and sealed it over him, to keep him from deceiving the nations anymore until the thousand years were ended. After that, he must be set free for a short time.
4 I saw thrones on which were seated those who had been given authority to judge. And I saw the souls of those who had been beheaded because of their testimony about Jesus and because of the word of God. They had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ a thousand years. 5 (The rest of the dead did not come to life until the thousand years were ended.) This is the first resurrection. 6 Blessed and holy are those who share in the first resurrection. The second death has no power over them, but they will be priests of God and of Christ and will reign with him for a thousand years.
Ok, here are a couple questions to consider. You don't have to answer them if you don't want to, but they're worth considering.
I'd like to answer them if you don't mind.
1. Are the nations of the earth no longer being deceived?
They are no longer in complete spiritual darkness as they were in Old Testament times because the light of the gospel has spread to all the nations of the earth. The context of Satan's binding has to do with what he was able to do before and after the life, death and resurrection of Christ and the spread of the gospel of Christ.
2. Have those who were beheaded been resurrected and living on earth to reign with Christ for 1,000 years? IOW, has the first resurrection already happened?
Their souls are in heaven with Christ and they reign with Him there. Yes, the first resurrection has already happened, but not in the way that you are thinking.
Acts 26:23 that
the Messiah would suffer and, as the first to rise from the dead, would bring the message of light to his own people and to the Gentiles.”
Christ's resurrection was the first unto immortality. In 1 Corinthians 15:22-23 Paul said that Christ's was the first resurrection and then next in order are those who belong to Him at His second coming. So, the mass bodily resurrection of believers that will occur at His second coming is not the first resurrection, but rather the second.
So, when it talks about those who have part or share in the first resurrection, it's talking about having part or sharing in His resurrection. Which all believers do spiritually when we are saved. That's why Revelation 1:5-6 says that even now we are priests in His kingdom, which shows that Revelation 20:6 is not speaking of a distant future reality, but instead of a current reality.
Now, I have a few questions for you to think about and you can answer them if you want.
Where were the souls of the dead martyrs that John saw located?
Is Jesus Christ your King right now? If so, do you understand that means you are in His kingdom now since He is not a King without a kingdom?
Colossians 1:12 and giving joyful thanks to the Father, who has qualified you to share in the inheritance of his holy people in the kingdom of light. 13 For
he has rescued us from the dominion of darkness and brought us into the kingdom of the Son he loves, 14
in whom we have redemption, the forgiveness of sins.
Compare the following 2 verses:
Revelation 20:6
Blessed and holy are those who share in the first resurrection. The second death has no power over them, but they will be priests of God and of Christ and will reign with him for a thousand years.
Revelation 1:5 and from
Jesus Christ, who is the faithful witness,
the firstborn from the dead, and
the ruler of the kings of the earth. To him who loves us and has freed us from our sins by his blood, 6 and
has made us to be a kingdom and priests to serve his God and Father—to him be glory and power for ever and ever! Amen.
What does Revelation 1:5-6 indicate about the timing of Christ's reign with those who are priests in His kingdom? Can you see that John wrote in present tense there? He was talking about a current reality. Should that not tell us something about the timing of Revelation 20:6? I definitely believe so.