The trouble with Creationists is that they make a basic logical error (okay, they make many such errors): disproof of a theory is not sufficient to establish the truth of a rival theory.

Yes, there are problems with the theory of evolution (which I do espouse, BTW), but just stating that there are difficulties with it does not mean that creationism is automatically established. They still need to do the work in setting up the evidence needed for proving Creationism, and they can't do it.