Intelligent Design . . . coming to a classroom near you?
http://exitsection.blogspot.com/2005/09/on-intelligent-design-and-scientific.html
Here's my theory on teaching intelligent design and the scientific method . . . if the students are really encouraged to think for themselves and apply the scientific method, and not subject to a lot of brainwashing elsewhere, they should be fine. (Eventually, after they get over the confusion, and probably become more bitter and disappointed than your home bred agnostic).
Basically, the holes in many of the religious theories, or particularly some exposure to religious fanatics alone will convince kids or teens that something smells fishy about many fundamentalist teachings, forcing them to work out their own beliefs. If they are in the least bit contemplative, they will be disappointed in one of the systems, and when they get more logical than wishful, you can guess which way they will lean.
My parents didn't try to convince my brother that there was no God . . . they would just point out the holes in logic of some of the religious stories he brought home from school. They would explain how some of his assumptions about God differed from most Christian teachings (he was a pretty nice kid with an optimistic imagination) and now he is probably more jaded than someone who was taught to be atheist. Noone at home told him there was no God, but that has been his opinion since he reached the age of abstract thought, pimples and b.o. It wasn't that long after he stopped beleiving in Santa Claus, I'd expect.
With me, they did actually argue that there was no God. I am a milder version of agnostic/atheist than my dad or my brother, who are definitely Bitter Atheists, borne of closer association and earnest consideration of religion.
About the kids in the class that have already been brainwashed elsewhere . . . well, they were brainwashed. They weren't going to believe in the standard scientific version anyways, right?