Hard to see why Acts 17:26 provides any support for a Creationist perspective, since it speaks only of humans.
It is true, actually, that humans all around the world have less genetic difference than chimpanzees living in just their home territories in Africa. Pan Troglodytes comes in 5 variants, P. T. Verus, P. T. Troglodytes, P. T. Ellioti, P. T. Scweinfurthii, and P. T. Marungensis, and they have more genetic variability between them than do the Swahilis in southern Africa and the blondes of northern Europe or the Inuit of northern Canada.
And Acts 17:26 doesn't even begin to contemplate that millions of other plant and animal species on our planet, and how they can actually be mapped (something Darwin didn't know) showing how the same plant that once inhabited a small geographic area in Gondwana, that eventually split apart to become the known continents. This plant, a giant fern called "glossopteris," along with 3 other known fossils, mesosaurus, cynognathus and Lystrosaurus are all now found in fossil form various distant areas of the world. Glossopteris is found in S. America, S. Africa, S. India, Australia and Antartica. Cyngnathus is found in fossilized form in central S. America and central Africa.
From that, you can learn the rest for yourself, but this is, to anyone willing to actually look at it, incredibly compelling evidence supporting both evolution and the theory of continental drift.