Very good question!
In the context of this discussion, GRAVITY is analogous to CHANGE (in organisms).
We can prove that Gravity exits, and we can prove that Change happens (exists).
Where the Theory of Evolution, and the Theory of Intelligent Design come in, is the WHAT and HOW.
We can Theorize about WHAT gravity is, and how it works. And we can Theorize about WHAT mechanism causes the changes in organisms, and how it works. But at this point in time, we have no proof of the WHAT and HOW, of either Gravity or the Change in Organisms.
Neo-Darwinism is random wrt fitness; it has no goal, and lacks any intelligence.
- The Current Law of Naturalism (as I see it)
Here we have a belief statement from science that treads on many other beliefs but allows atheists who preach atheistic science,... comfort.
But we can look at the theories and the influence such as - the theory of gravity does not become sociobiology the theory of gravity does not have memes the theory of gravity does not worry itself with beliefs from any side of the id/evo/creo/ equation.
Now if anyone should equate gravity and neo-darwinism they should offer that we survive only because we now stick to the earth and those that did not, floated into space and died.