Yes, that's exactly what evolution is. The problem being, evolution requires millions of years and a massive, diverse gene pool for mutations to take place in. Then those mutations have to be found either passive or useful. Natural selection kills off the more hindering mutation and the stronger more useful live on. This couldn't happen if 2 people were the beginning of it all. Not to mention Adam and Eve were supposed to exist 6000 years ago. That's not even close to enough time for evolution.

The specific "time" that it takes for evolution to occur is iffy since no one has documented how long it takes for a species to turn into a new species. For a small mutation (such as darkness of skin or other race-related bodily features) it shouldn't take as long as a fish turning into a bird. Wouldn't a couple hundred generations be enough to see a fairly wide-spread race of humans? For example, let's say that two white parents have a black kid due to a mutation that the kid gets. That kid, should he end up reproducing, will have the possibility to transfer that aspect to his offspring. Let's say that the black kid ends up having 4 children and one turns out to be black, the same thing happens to that kid and so forth. If this was in an environment that was very sunny then the kid who gets a mutation and becomes black is less susceptible to the harsh sun and is more likely to pass on his genes. It seems possible that that could happen in around 10,000 years. Thoughts?