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Gravity is not just a theory, it is also a law.

As a theory, it has been completely changed out several times now, with each new theory invalidating the old one completely.

As a law, it has been modified by relativity, but on a general basis the calculation holds true.

Science is thought of well because of its "public" nature -- anyone can reproduce the experiments and get the same results. However, this only holds true for empirical hypotheses and to a lesser extent the generalized laws that come from them.

What makes a theory into a law? Absolutely nothing -- they are completely different classes of ideas. However, laws are directly testable, because to be a law requires that you specify a relationship mathematically. A theory is simply a conceptual model. Theories are not subject to direct test the way hypotheses are. Why? Because ultimately we cannot in principle deduce what is occurring behind the scenes on empirical evidence alone. It requires interpretations or a priori assumptions.

Now, as far as biological laws are concerned, I am not aware of creationists ever faulting laws or empirical evidence. What is faulted is the interpretation of that evidence.

Likewise, while no practicing scientist is suggesting that NASA change its gravitational calculations, the theory of gravity itself is still very much an open question.

So, what laws have been proposed on the basis of evolutionary theory? Most of the ones attributed to "evolution" are actually in the field of population genetics, and, given that genetics was actually founded by a creationist I find it ironic that genetics is where most of modern research is going and yet somehow "nothing in biology makes sense without evolution".