Ok Donzo, Rather than regurgitate some google-found irreducible complexity rebuttal to you, that you'll no doubt already know, I'm just going to cut to the heart of it. I.D. starts with the assumption that there is a creator (designer, whatever) and sets out to find evidence of he/she/it. Science starts out with the assumption that what we observe with our senses is real and that we don't know anything for sure.
If you start out assuming something is already fact, why do you need to find proof of it? You've already made up your mind. I, on the other hand, am more comfortable assuming that I don't know a damned thing. That way, I can work from the bottom up rather than the top down. If finally reaching the top leads me to the Lord, so be it. I will have earned my way there without taking any dead-end shortcuts.