Venema says there is no way we can be traced back to a single couple. He says with the mapping of the human genome, it's clear that modern humans emerged from other primates as a large population — long before the Genesis time frame of a few thousand years ago. And given the genetic variation of people today, he says scientists can't get that population size below 10,000 people at any time in our evolutionary history.

To get down to just two ancestors, Venema says, "You would have to postulate that there's been this absolutely astronomical mutation rate that has produced all these new variants in an incredibly short period of time. Those types of mutation rates are just not possible. It would mutate us out of existence."