But nobody believes that DNA just appeared on the scene in its current form, all ready to go. Billions of tiny coincidences, too insignificant to be considered on their own, create the illusion of a (cumulative) coincidence that baffles the mind in its complexity.
I imagine DNA's origins are as humble as our own.
Yes but evolution takes time. The way new science discoveries found out that we developed too fast for what evolution normally would take for us to be the way we are nowadays.
There was an interesting article in New Scientist about this, let me see if I can find a reference online...