It's funny how creationist attack the theory of evolution using their own ignorance of the meaning of the word theory. Guess what, it's not only used in the sense of a conjecture. Why they can never learn that is beyond me.
the·o·ry [thee-uh-ree, theer-ee] Show IPA
noun, plural the·o·ries.
1.
a coherent group of tested general propositions, commonly regarded as correct, that can be used as principles of explanation and prediction for a class of phenomena: Einstein's theory of relativity. Synonyms: principle, law, doctrine.
2.
a proposed explanation whose status is still conjectural and subject to experimentation, in contrast to well-established propositions that are regarded as reporting matters of actual fact. Synonyms: idea, notion hypothesis, postulate. Antonyms: practice, verification, corroboration, substantiation.
3.
Mathematics . a body of principles, theorems, or the like, belonging to one subject: number theory.
4.
the branch of a science or art that deals with its principles or methods, as distinguished from its practice: music theory.
5.
a particular conception or view of something to be done or of the method of doing it; a system of rules or principles: conflicting theories of how children best learn to read.