"I think you just ignored all of my questions about the implications of two people populating the planet. It actually would have been impossible, not just difficult, to populate the world with only two humans".
*Why? Exactly why? What specificlly makes it impossible?
"Even if it were possible, we still have the problem of incest being considered one thing..."
*Being considered WHAT 'one thing'?
"(although we still don't know how allforihs knows this), and against the Law."
*Against WHAT LAW? Laid down as Law WHEN??
"And then God changing His perfect Law to make incest mean something else."
*When did God change His perfect Law? The 10 Commandments & Levitical Law was not even given until the time Moses had led Israel out of Egypt. What are you talking about? What chronology are you running on? What 'Perfect Law' are you talking about?
"What's up with that?"
*What's up with what?
"Exactly. So was incest OK up until Leviticus was written, and then suddenly God changed His mind and the Law?"
*Define what you mean by incest because it is a broad subject interpreted differently by diffeent societies at differing times.
"That it was or was not against the Law is beside the point."
*So it has gone from being a major point to being beside the point?
"Humanity's gene pool would have, stagnated, festered, and died long ago if incest (inbreeding) was the way we populated the planet."
*Pure assumption on your part, not drawn from science or medical fact. The 'gene pool' did not have the mutations present at later ages so was more pure without defects showing up.
"Humanity has flourished, in fact, so incest (inbreeding) must not have been the way we did it."
*Another wild assumption not based on verifiable scientific fact.
"Which begs the question, were there other people besides Adam and Eve to begin with?"
*The only one who can answer that is God, and according to His Word and historical record given to mankind, no there were not. Adam lived 930 years before he died, quite a bit of time to have offspring, each of which married and had offspring, each of which married and had offspring, and so it was and is to this day. It's exponetial multiplication.
The answer should be obvious.