And AC/DC said...
“Let There Be Rock!”
Or, on the sixth day God created mankind. "Let us make mankind in our image, to be like us. Let them be masters over the fish in the ocean, the birds that fly, the livestock, everything that crawls on the earth, and over the earth itself!"
Long-lasting pulses of high-energy radiation sweeping over the earth would explain alterations to the DNA of organisms on the planet, including ours.