To clarify, many people do not have a understanding of what constitutes scientific “theory.” In science: theory is not the same as a theory used in common language, it does not refer to an approximate explanation of a phenomenon, but instead is a system of mutually supporting evidence and fact which offers itself as a model to explain an aspect of reality. “Theory” is a higher form of truth than fact, using facts in conjunction with one another to form a grander statement about the nature of reality.

When creationists say “evolution is a theory, not fact” – they are not only confused but superbly misguided, basing their worldview on a merely incorrect definition of a word.