Actually, keeping some continuity in our discussion, the premise was that if God had fixed the initial problem of sin back in Eden and restored mankind to perfection you said:
... then we wouldn't be here. The Earth would have filled up long, long ago and God would have had to stop procreation of humans.
Well, your father is suggesting that as we procreated, the Garden of Eden would have had to expand. The Garden was not the entire Earth. Once Adam and Eve were given the big boot, they had to deal with a very different and harsher environment that the one in the Garden. So there were 2 different environments on the Earth back then.
So it seems to me that your father is suggesting that as our populations expanded, God would have to be doing some Earthly cleanup because things like radioactive elements, sinkholes, volcanoes, quicksand, bogs, marshes, meteor craters, deserts, inaccessible mountain regions, salt flats etc etc that were all created by God would have had to go. But didn't God finish creating after the 6th day? So your father is suggesting that God would start creating again. No where in the Bible does any of this exist. This is pure fantasy on your father's part. A nice bedtime story, nothing more.
Keep in mind, if God had restored mankind to perfection right then, the water canopy would likely still be in place and the earth would be a paradise with perfect living conditions regardless of where you were. So no need to rule out any acreage. It would all be perfect - (paradise remember?).
Oh right. The big bag of water surrounding the Earth story that cannot be proven. Again, I point out that the environment outside of the Garden of Eden was not the same lovely environment as inside, even with the bag o' water. I have long since given up believing in the stories from the Bible.
And for kicks, just what do you think God had planned for mankind in the way of procreation and expanding populations.
As a child, I was told God turned his back on all mankind. At this point in my life, I do not believe in the God of the Holy Bible. Therefore, I do not believe "God" planned or is planning anything.