I think perhaps there is a misconception about working definitions. For instance, the Theory of Gravity, although a good working theory, has not been "proven" and therefore is not a Law. Somewhere in the Universe, under the right conditions, gravity may not function as we know it.
Nevertheless, as scientists, we proceed as if the Theory of Gravity is in fact a Law...until demonstrated otherwise.
The same is true of Natural Selection. The Theory of Evolution is subject to the same conditional approval as the Theory of Gravity. As new data become available, both theories are modified.
At least that is what an honest scientist will tell you. Of course there are charlatans in every profession - would you not agree?
we proceed as if the Theory of Gravity is in fact a Law
I understand your point but to me there is a big distinction in the Theory of Gravity and the Theory of Evolution. It seems to me that scientists have a far greater mathematical grasp on gravity than they do on evolution. If a 1 ton object was a 1000 or 100,000 miles out in space there could tell you the exact weight of that object. Darwin evolution isn't even close to being that accurate. It presumes way too much, IMO, to even be compared to the Theory of Gravity. BTW, I read an article here on FR a couple days ago that is testing Einstein's Theory of Gravity. Something about space/time warp which I have no clue of but am willing to wait 15 months for them to sort out the data and see what it says.
The Bible has no argrument with true science and I don't have a problem that a true scientist would exclude the existence of any god because he uses only what he can measure or whatever to come to a conclusion, if he does. But evolution comes with no set of values or virtues. If believed in a person can do whatever they choose without consequences. But both you and I know that isn't the case which points to spiritual laws that are in affect for everybody whether they believe in God or not. Successful people all do the same thing and failures all do the same thing. A personal gripe I have is that way back in high school I had some JO who tried to hammer Darwin evolution into me. I was smart enough to play his game but I didn't believe a word of it. Why should evolution be forced which I see the gays doing with their agenda?