Questions About The Millennium

Q. I have a question that I just can’t seem to find the answer to,  so I’ll just jump right into it- I don’t understand the Millennium period- do we as saved Christians come back in our heavenly bodies to dwell with the tribulation saints?

And I also read that God removes all non believers from the earth when he comes back but yet at the end of the Millennium there is as many as the grains of sands ready to fight with Satan? And when a tribulation Saint dies a natural death during that time do they instantly get their heavenly bodies?

A. Believers dwell in the New Jerusalem during the Millennium.  Surviving Tribulation believers live on Earth.  God does remove all living unbelievers from Earth at the 2nd coming, so it’s the offspring of Tribulation believers who join Satan in the final rebellion. The Bible doesn’t mention either the death or destiny of Tribulation believers who enter the Millennium.  And while I can’t imagine there won’t be any, it also doesn’t say anything about people being saved during the Millennium.