Theory or Fact?

A theory is not a fact. They differ by definition. Theory of evolution is not a fact. The law of gravity is
[quote] A scientific theory differs from a scientific fact or scientific law in that a theory explains "why" or "how": a fact is a simple, basic observation, whereas a law is a statement (often a mathematical equation) about a relationship between facts and/or other laws. [/quote]

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ElwoodBlues · M

Nothing in science, no theory, is provable, not even the theory of gravity. The best we have is increasing evidence that if the theory is wrong, it's only wrong by a tiny bit.

Newton's theory of gravity makes predictions to better than 1 part in a billion. And we still use it. But it's wrong. It's been supplanted by General Relativity which makes slightly better predictions. However, GR isn't proven either.

A theory gets supplated when a better theory that explains more arises. There is no such replacement for evolution. Evolution is the best explanation we have for the forms and species we see in life on Earth.