Just curious... did you post these on RITA or someone else ?? great posts.
Anyway,Population of the New Jerusalem: I don't think we know for sure but possibly still in the billions after this, ... (we've go a clue) in Revelation 20:7-9
Rev 20:7 And when the thousand years are expired, Satan shall be loosed out of his prison,
Rev 20:8 And shall go out to deceive the nations which are in the four quarters of the earth, Gog and Magog, to gather them together to battle: the number of whom is as the sand of the sea.
Rev 20:9 And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them
From what the Bible states, the earth in the beginning was inhabited inside and out (still inhabited inside in my opinion).The older Bible translations illustrate this interior/exterior habitation much more accurately. We have to wonder about Constantine's motives for "selecting" the books he selected for the Bible. Regardless, God's word remains intact and sufficient, but for those who like deeper studies we would be amazed what what for instance the book of Enoch has to say about this and so many other "taboo" topics. Why is Enoch's book (conveniently) not included in the Bible? I mentioned it because if people were to study it like Jude and others of the Bible did, they would be astonished at its content which in my opinion gives us an idea of the NJ environment.
God Bless You,T.O.