My point was that evolution is not 'only' a theory. It is a fact.
The main confusion is that people think 'evolution' is controversial and denied by creationists. Creationists don't actually deny evolution, although many say they do because they don't understand what they mean. What they actually deny is an entrirely separate theory called 'The Theory of the Origin of Species by Natural Selection'. This holds that new species derive from pre-existing species. The Theory of Evolution merely states that a given species can evolve over generation within its own terms i.e. getting taller, having larger feet, etc