Like many modern geneticists, Wells starts with the assumption that we all came out of Africa after humans branched off from their ape-ancestors approximately 5 million years ago. However, the Bible tells us that we were created in the image of God about 6,000 years ago and that the human population dispersed from Babel with many likely settling in Africa. ... Genesis 11 tells us the rest of the story—we came out of Babel, not out of Africa.Now, this is one of my pet peeves with creationists: the conflation of "assumptions" (or "presuppositions") with "conclusions." There are assumptions at work, of course (though these are based based, in turn, on the way inheritance, mutation, and genetic drift are observed to work): that, e.g. the area of greatest genetic diversity is probably where a species has been the longest. Thus, e.g. silkworms are found, unsurprisingly, to be most genetically diverse in China, where they originated and were first domesticated. Note that this assumption does not in any way depend on the assumption that humans share ancestry with any other species. By itself, it does not depend on the assumption that the human species is a couple of hundred thousand rather than six thousand years old. Indeed, it does not even depend on the assumption that geneticists are
If human beings had dispersed from "Babel" (presumably in what is now Iraq), then we would certainly expect to find that the greatest variety of mitochondrial DNA was concentrated in southwest Asia, since humans had lived there longest and their local gene pools had had the longest time for mutations to occur and spread. We would expect sub-Saharan Africa to show no more variety than, say, Australia or North America. Of course, it's conceivable that not merely "many" but the overwhelming majority decided, when they scattered from Babel, to travel en masse down the Nile and into sub-Saharan Africa (though it would be hard to coordinate the march, given the miraculous confusion of languages that occurred earlier in that chapter).
Explicit young-earth creationists are even more explicit than ID proponents in asserting that reliance on evidence is just an arbitrary and even anti-theistic bias.