Perhaps it is you who does not understand the nature of science.
All science is tentative, and nothing is ever proved! No theory, not germ theory, not the theory of gravitation, not a one is proved! Your statement denigrating the theory of evolution, and reducing it to an hypothesis because it hasn't been "proved" is simply incorrect and brings into serious question your knowledge of science and its methods.
The theory of evolution is a theory, and has been for a long time. Calling it an hypothesis does not make it one.
See the definitions on my FR home page.
Even given your position on evolution, saying what you just posted in a classroom would likely get you fired, or get the ACLU sicced on you.
“Evolution is a fact.” Stating anything to the contrary, even as you have, or questioning that statement in a classroom is verboten.