I'm pretty much completely against the teaching of Intelligent Design in public school, but I don't think the question behind it is an invalid one. Where did life begin? This is a question for science to answer and in time I think it will.
The idea of an act of creation isn't completely against everything we know in science: see THE BIG BANG. Proof positive that the universe in fact did have a definite beginning. Knowing that should open the door to many other questions.
But as far as evolution is concerned, it is a proven phenomenon, as science has seen it taking place in nature on the micro scale. The largest point of contention with creationists is that there is very little proof of species turning into something entirely different. And with that in mind I point out
whales. Fossil evidence shows beyond any doubt that they evolved from a land mammal.
Eat that, Ben Stein.