Thread moved on rapidly. So I'm just going to quickly say my short line of defence and walk away.
As Draugnar said, I'm not referring to the co-opted form of creationist ID. But the ideas that are central to ID, as an actual system.
The best way I've heard it described was this.
Imagine a fractal.
The formula is created through intelligent design,
and from it a miraculous image springs, with infinite complexity. That is the expression of this first principle formula, as it develops.
Nothing against evolution, the site I linked you too earlier even discussed the compatibility between ID and evolution.
Finally Big Bang,
There are other equally valid theories. Yet so far as I can tell, everyone simply accepts the big bang. Plasma theory is another important theory, Creationism is in away another branch of the big bang (One that I think is incorrect), ID could also follow the big bang theory, as it being the idea that formed everything. If you want to teach big bang theory, as science fine. But explore also how these other ideas branch off of it, and teach plasma theory as well.
One final observation on big bang. It isn't empirical. Dark matter is something we have never been able to apprehend with any of our five senses. Its one of those things that must just be taken on faith, and observation of the macro world, searching for potential effects. Which is exactly the form of study that real ID is based on.