First and foremost, creationism is not and has never been a scientific hypothesis, theory, or idea. Therefore, it should never be taught in a science curriculum.
To correct one's definition of theory:
Theory in the lay person's world is for the most part a hunch or an idea. Unfortunately, when people discuss scientific theories they use this definition to describe them which is a classic straw man argument. A scientific theory is vastly different from the layman's definition. An idea in science does not become a theory until is has been tested by many in the scientific community and generally accepted as the best answer to a problem that the scientific community has developed. However, in science we cannot prove anything to be true. The reason for this is because to prove something it needs to be verified infinitely (an impossibility of mankind). Therefore, a theory can be proven false (needs only one experiment to show something isn't true), but a theory can never be proven to be true. Therefore, in science the term theory holds a lot more weight than what lay people deem the word to mean.
Here are some definition of terms used in science:
Fact: In science, an observation that has been repeatedly confirmed and for all practical purposes is accepted as “true.” Truth in science, however, is never final and what is accepted as a fact today may be modified or even discarded tomorrow.
Hypothesis: A tentative statement about the natural world leading to deductions that can be tested. If the deductions are verified, the hypothesis is provisionally corroborated. If the deductions are incorrect, the original hypothesis is proved false and must be abandoned or modified. Hypotheses can be used to build more complex inferences and explanations.
Law: A descriptive generalization about how some aspect of the natural world behaves under stated circumstances.
Theory: In science, a well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses.
Now using the scientific definition of theory, the theory of evolution is a well-substantiated explanation of some aspect of the natural world and does incorporate, facts, laws, inferences and tested hypotheses. The problem is most people think the theory of evolution today is what Darwin stated. This couldn't be further from the truth. Evolution theory does not claim man came from monkeys; in fact, it actually argues against it. As science has learned more, even species that we thought were ancestors of early man (such as Cro-Magnon and Neanderthal) are found to be ancestors of hominid, not h o m o sapiens. However, one cannot possibly argue against the theory that species do evolve through mutation, survival of the fittest, and adaptation. The current theory, argues those points. Therefore, to debate evolution vs. creationism is a fairly mute point and tries to argue science with religion, a very dangerous subject since one is based on learning through the scientific method and the other is learning through faith. There is no platform for the two sides to debate from.