Question for the theist

[Esquilax]

To the OP's question, there was sufficient genetic variation left in Noah's sons (from Adam and Eve) and their wives to account for what we call "Races" today.
I might note that after all this time - there is much less variation possible now- unless the races mix back again.

Geez, I can't believe everyone else let you get away with this one!

I've come across this argument before, that pretends that "genetic variation" is something that one can accumulate and spend like a currency, but that's not the case. Do you know how many people it'd take today to maintain a stable population? Here's a hint: it's more than ten.

Just handwaving all this as "from Adam and Eve," doesn't actually account for the practical effects of that, not that I think you actually know anything about what you're talking about. It's pretty obvious that "genetic variation" is just a magic word you're invoking to be vague and avoid the fact that such a thing just isn't possible.