Science requires an explanation that doesn't involve "Magic". In fact, you could say that the entire purpose of science is to debunk magic ("Q:Why does this stick burn? A: Magic), and replace it with well-understood and tested principles. In my opinion, no scientist is more alive than when existing well-understood and tested principles are overturned - see heliocentrism, relativity, quantum mechanics, dark matter/energy. A student who critically studied evolution and was able to overturn it, within the principles of science, would be celebrated as Copernicus, Einstein, Heisenberg, or whoever formulates an answer to dark energy or matter.
Creationism, however, is completely outside the principles of science. Its fundamental principle is that "magic" - whether Yahweh, Jehovah, Zeus, Thetans, or name-your-favorite-god - created man through an unknown and unknowable process, ranging from "in his own image" to "sneezed and set in motion the entirety of the cosmos with the intended end result of creating Man".
Questions of "how" or "why" end up at "because "magic" made it so". Sure you can push back the edges - "Why is the universe expanding?" "Because "magic" made it so" - but at it's heart, it's either anti-science ("here are questions you cannot ask