First off, last time I checked it wasn't actually a fact. It was still a theory. Coming from a Christian standpoint, I honestly don't get the whole evolution vs. creationism fight. Nowhere in the bible does it say "and God created the animals and told them to never ever evolve in their life because that would be horrible." In other words, even though I'm a Christian many parts of evolution and other such theories make complete sense to me.
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Before you say that, understand what a scientific theory is. Here are some other "just a theory" examples; Gravity, Cells, Atoms, Germ theory of disease, and many more.