The theories are all "equally unprovable". As is just about everything outside of math and logic, as was discussed above. That does NOT mean the theories are all equally plausible, are equally substantiated, or do an equal job satisfying the scientific method. The latter points are what Euxox meant when he mentioned the "equal playing field". Evolutionary theory has been supported by countless observations and analyses, and it also came right to the point of predicting the existence of genes (which I would hope you find a viable concept). For Dr. Carson (or anyone) to dispute the reality of evolution, he must either be profoundly unaware of the mountains of evidence in support of it, not intelligent enough to understand said evidence, or not have a rational basis for assessing its validity. Or, as Dawkins said, "Anyone who disbelieves in evolution is ignorant, stupid, or insane." Harsh, but true.