The Theory of Evolution is a theory. (Disagreements are over small details, nothing for creationists to get excited about.)
Just how many different theories of evolution are there?
Just one, and its a real good one too.
From an NSF abstract:
Those who oppose the teaching of evolution often say that evolution should be taught as a "theory, not as a fact." This statement confuses the common use of these words with the scientific use. In science, theories do not turn into facts through the accumulation of evidence. Rather, theories are the end points of science. They are understandings that develop from extensive observation, experimentation, and creative reflection. They incorporate a large body of scientific facts, laws, tested hypotheses, and logical inferences. In this sense, evolution is one of the strongest and most useful scientific theories we have.Modified from RadioAstronomers's post #27 on another thread.
The existence of 'mountains of fossil evidence' vs. "they don't exist" is hardly a small detail.
Neither is small gradual changes over long periods of time vs. punctuated equilibrium.