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There are two meanings of the words fact/know/prove/etc.
There is the philosophical, pedantic, epistemological version: Essentially we cannot know anything, after all we could be plugged into The Matrix...
There is also the ordinary everyday sense of these words. It is a fact that New York is a city in America. I know that I am sitting at my computer typing. It is a fact that the earth is round, and that it revolves around the sun.
Evolution is a fact in the same sense of the word that it is a fact that the earth is round.
You can get pedantic and philosophical and demand that evolution is "just a theory", but to ensure that you are not being inconsistent, it is necessary that you apply that same status to everything. ("it is only a theory that things fall down, not up")
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