@S.P.A.O.
Intelligent Design is not even a theory. I have not yet heard a coherent theory of Intelligent Design, i.e. what exactly it postulates, what we can determine based on this theory, and what new predictions can be made and tested? The most I've heard is the vague notion that maybe all living life forms came to be in just about their present form by some divine creator. Other than that, ID seems to be mostly about trying to disprove evolution.
Evolution is very much a science that follows the scientific method. I don't know where you heard that this was not the case, but clearly you haven't studied evolution to any appreciable degree... evolution is a more clearly understood mechanism than gravity. It is not a vague hypothesis, it is fact that evolution occurs wherever there is replication, variance, competition, and heredity. This has been proven countless times in many fields OTHER than life. Evolution is an inevitable phenomenon where such conditions exist, and life is the quintessential example.
Evolution is based upon an absolutely immense body of information and research, all of it corresponding perfectly with the idea that over a long period of time, organisms have undergone natural selection. If you really want me to teach you and give you specific examples, I can, for a long time, because the evidence is so overwhelming.
One of the most important aspects of evolution as a scientific theory is that accurate predictions can be made. After all, that's the whole point of the scientific method! Virus resistance to antibiotics can be predicted... innumerable characteristics of a creature that lived 150 million years ago can be inferred and predicted from it's place on the phylogenetic tree and then affirmed by fossil evidence.
You can predict things like noticing that one genus of fish has a characteristic formation in it's swim bladder, and notice which others do not, and without even looking, I can predict which species of fish must have this formation based on it's place in the phylogenetic tree, and voila, when I do check, I find my predictions were absolutely correct. Countless predictions of this sort and others have been made, and every one of them have been correct.
The only real evidence that I've heard in FAVOUR of ID (and not just some trumped up evidence that is AGAINST evolution, and doesn't necessarily prove ID, because this is no dichotomy) is that, the world is filled with such immense complexity and everything works with surprising efficiency and harmony, that I must conclude a conscious designer.
Allow me to point out just a small fraction of the major design flaws that not even a mortal engineer would ever make... We have a common passage shared between eating, breathing, and speaking, all of paramount importance, and together make a lethal combination in the form of the ridiculous number of people who die of choking every year. Any designer would be quick to separate as such. Oh, and having your reproductive organs share real estate with your excretory passages? Really intelligent... Not to mention the countless vestigial features and behaviours, such as appendices, pinky toes, hiccoughs, the list goes on.
I hope you don't throw astronomy out the window, because it indicates that in this mind bogglingly large universe life is only known to exist in the tiniest fraction, in a tiny mote in an almost eternal expanse we call Earth. And upon this Earth, complex life can only inhabit a small percentage of the surface. That's incredibly and astronomically wasteful... I have no doubt that humanity will soon outstrip our intelligent designer in our ability to design efficient ecosystems... Is our existence in such an infinitesimal corner of the universe really indicative of a divine creator, or perhaps simple driving physical forces playing the astronomical odds? You can say things seem just so perfect for us, but if they weren't we just wouldn't exist. The fact is we would only ever exist in places where so many conditions come so perfectly into play, and science shows us the mind blasting majority of places that aren't. It would be like a conscious puddle noticing how perfectly shaped the hole it was in was for it, and concluding that the hole must have been made expressly for the puddle's existence.