Yes, ID is a theory, it meets all the qualifying criteria to be a theory. There is as much to support a theory of ID as a theory of abiogenesis. Science and theory are also, in a way, a matter of "faith." Faith is the belief in something that hasn't been proven, and as we all know, science can't "prove" or "disprove" it can only "predict." When you close your mind to any possibility that science hasn't provided an explanation for, you actually undermine the very principles of science.
I've heard a good many arguments for ID, and I have never heard any of them claim it "fills in the holes" of science. I agree, that statement IS retarded... which is why I think you probably came up with that all on your own. And it seems to be YOU who is failing to take into account future discoveries, you did ask... Where is the evidence to support God guiding evolution? This indicates you need evidence to believe something is scientifically possible. Also, you seem to want to believe that science, an understanding of our physical world, can somehow provide explanations and evidence for things associated with a non-physical world. Like I said before, it's really no less bigoted than believing your religion has all the answers and science is bunk.