Scientists can no more "prove" evolution than they can "prove" relativity, gravity or the germ theory of disease.
All of these theories will only be around until a better one is produced.
They can only be disproved by scientific evidence.
So far there is no scientific evidence to disprove evolution.
ID simply represents a failure of imagination; "I can't figure out where eyes evolved from and it's too hard to learn enough biology to look it up, so it must be ID"
True Creationism is an article of Faith and does not resort to false arguments.
And there is also no scientific evidence to prove evolution, either. It takes as much faith to believe in evolution as it does creationism.