What you seem to be saying, or this student seems to be saying, is that the school--or at least this professor--has to teach creationism as science, rather than evolution, and be graded differently than the rest of the class or student body who are being taught evolution--and that this student can define curriculum for the rest of the class or student body. If that's the case, why doesn't this student take a class in which creationism counts towards a science/biology credit or transfer to a school in which creationism is the biology course?
No, silly. He can teach "evolution" (meaning evolutionary theory of origins of species) until he's blue in the face, and require that students demonstrate knowledge of all the rationale and theory. Just like a professor in the religion department can teach "Judaism" or "Catholicism" or "Hinduism" or what have you. But if getting Federal dollars he can't exercise his duties in a religiously discriminatory way; he has to leave it open to the student whether to profess this kind of "evolution" as personal belief.