Stringsinger said, (quite correctly):

Here's the problem. Evolution is a scientific fact. (All reputable scientists unanimously agree).

But that's confusing to some, because they don't understand the difference between "evolution" and (usually Darwin's) "theory of evolution".

A theory is an attempt at a systematic rational explanation of a complicated set of facts.   As in "the theory of torts" in the law, or "nuclear theory", or "music theory". No one conversant with those fields has any doubt of the existence of the underlying facts, but there's varying amounts of room for elaboration or fine tuning of the theories relating to those sets of facts.

To say "theory" does not mean "speculation", as is often used in the phrase "a mere theory" as so many creationists are fond of dismissively phrasing it.

Dave Oesterreich