What would worry me about having a literal creationist in office is that the President submits the budget to Congress--and if the President decides that scientific research based on evolutionary principles should not be funded, he can do a large amount of damage that would take decades to undo. Any significant life science research becomes impossible when it isn't based on biological theory.
Another danger is that the President has a lot of influence on culture. If he is pushing the message that people should forego science education because there is no scientific evidence that supports a literalist interpretation of Genesis, people will take that message to heart and make choices accordingly. And if anyone does not think the President has an effect on culture, they have only to look around at the current cultural insanity of legalized "gay marriage", promotion of homosexuality, and obsession with "transgender." This insanity comes from the top.
I can see how a surgeon might be able to get through med school and learn the technical skills without fully understanding evolutionary theory and all of its implications. But putting such a person in charge of deciding which science gets funded is, IMO, highly risky. I, for one, rather enjoy the medical advances made possible by life science research.
It has been more years than I care to remember since I was in a biology lab, but I don’t recall any need for evolution to enter into research re medical advances.
You’ll pardon me if I lack the faith necessary to believe that the immeasurable complexity of life on this planet could arise through random mutations, regardless of what “science” asserts.
Unless he's (she's??) a Mormon; of course.