"ID casts doubt on evolution, if not out disproves it. One need not prove ID to disprove evolution."
Scientific theories are merely refuted, not "disproven." The problem is that in order to refute Theory A, Theory B must better explain the observed phenomena. ID doesn't do that. ID doesn't make predictions that can be tested by observation.
a correction: scientific theories can never be proven, but can be disproven.
Cases in point: Phlogiston, caloric theory of heat, etc...
falsification criteria are vital to any scientific theorum.