Evolving from an amoeba to a human being in order to "enhance our chances of survival"? Are you kidding? Do you know how ridiculous that sounds? There is no example anywhere in the animal kingdom of one species turning into another; i.e., amoeba > human. There are only examples of slight changes in the size of a bird's beak, or the color of feathers, etc. Everything else is theory.
If you're sitting on a park bench, and you watch a truck drive by, in your reference frame that truck's clock is running slower than yours. And yet, at the same time, to the guy driving the truck, your watch is running slower than his clock. What I'm saying is, my clock is running slower than your clock, and your clock is running slower than my clock, depending on the reference frame you're in.
That sounds 100% ridiculous. It doesn't seem to make any sense. But it's true. Experiments with planes making flights around the world have verified it.
The problem is that it's happening on a (very, very small) scale that's removed from our everyday existence. We don't tend to notice effects on the order of hundreths of a millisecond. Similarly, we shouldn't be surprised when effects that happen on the scale of hundreds of thousands of years are similarly counter-intuitive.
And, to be clear, all of science is theory. Some theories are generally considered "more complete" than others, and I think most biologists would agree that there are more than a few holes in evolution as it stands today. But the core theory, that over many generations organisms change and differentiate as a response to external stimuli, is as close to bulletproof as a theory gets. Scientifically, all that's left to work out are the details.