Creationism and evolution are both effectively un-provable. Neither side can frame a hypothesis that is specific or predictive. Instead, they answer things after a new piece of evidence is discovered. Science should proceed from general principles to specific, testable predictions.
Actually, I use the basic tenets of evolutionary theory all the time when I am thinking about my experiments. As far as the types of results I should be looking for, and how I should interpret what I see, the theory is highly predictive.
This is interesting. Can you provide me an example?