I know someone is going to argue about that. My point is, we have discovered certain 'facts' about gravity and the way it works. Years from now, it may come about that our understanding was...not complete. But, most (probably all) scientists of today that have studied the evidence, agree with the majority finding. We all seem to agree that the evidence points in one direction, at least. Which is why we can on a base level make the statement: The law of gravity is a fact. (Even though it could one day be proven to be in error...in theory.)
Evolution, and its surrounding theories, are a best guess from the evidence provided. (In some peoples view.) I have no problem with that. I have no problem with someone saying that, at this time, from all the evidence, we believe that evolution is the most obvious way this has all come about. (Even though there are those that disagree.) What I do have a problem with is when people say; "Evolution is a fact." Nope, not according to our understanding of facts. It is an accepted theory of how things happened.
But I don't see what distinction you are making between evolution and gravity here. The things you say about gravity: e.g. the law of gravity might be prove to be false; it might be found that our understanding was incomplete; most scientists agree with the majority view; the evidence points in one direction ... all seem to be true of evolution. Indeed, evolution appears to have some advantages over gravity in this respect.
And the things you say about the theory of evolution could with an equal degree of accuracy be said about the theory of gravity.
Edited by Dr Adequate, : No reason given.
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