Just the fact that scientist's are currently battling just to copy the process even though the blueprint and the ingredients are already known, is testimony to the impossibility of nature not just copying DNA, but DESIGNING it spontaneously. The concept requires intelligent life.
So, you're intelligent designers ... did they design every living thing on this planet? Or are we just talking about humans? Did they just design the Human's DNA ... giving us intelligence as a "gift"?
Did they design Avian Flu ... and then hide it for eons in a (time release gel cap) time capsule?
Then comes the next question in the series ... why design such a world of life as this, and then disappear, never to check on your "masterpiece" again. Don't claim UFOs, either. I am pretty sure that the best of our progress is not found in some corn field in BFE, Kansas.
evidence over faith ... observation over theory