This is directly inspired by 2001: A Space Odyssey.
To my knowledge, the Theory of Evolution plus the idea of Natural Selection go something like this: Genetic mutations give a member of a certain species something unique. Natural Selection says on average the ones with positively affecting mutations will tend to outlive the one with negatively affecting mutations. For instance a bird may develop a sharper peak while another gets a blunt beak. The sharper beaked bird will have a greater chance at picking worms out from tree bark, etc. while the blunt beaked one will have great trouble. The sharper beaked bird will reproduce and his mutation will spread. Of course this would happen to multiple birds at once.
With that background knowledge (again, a very basic knowledge) I'm thinking whether or not something could become energy entirely.
First, I know that all things exist as either matter or energy. Nothing can really disappear without going into theoretical stuff like different dimensions, etc.
Second, I know that the human body, the pinnacle at this moment of Evolution on Earth, is far from perfect. We could have better everything. Who likes tooth decay anyway? Who likes hemorrhages? AIDS?
Clearly, the body is an undesirable factor. Bodies are what kill us, since we are the body. Everybody dies. But do we exist as our thoughts or as our bodies? Ultimately, millions of years into evolution from now if humans (by that time it will be the descendants of humans) have nearly everything they need, i.e. immunities for every disease, super-speed, etc, but still die of old age, would Evolution turn us into energy?
Evolution is about biology. Evolution only affects living things. If one goes by the idea that we exists as our bodies and we turned into energy, we would not be living. If one goes by the idea that we exist as our thoughts, we would be living organisms and affected by Evolution.
In conclusion: Could we evolve past our fragile existences as matter (in another possible case as machine-human hybrid, which would eventually break down) into energy with thoughts? Does evolution affect energy with thoughts?
I have to add: The only way I would ever believe in a God is if he is the sole survivor of a species which evolved into him.