Children aren't stupid.

Not even creationist children - this comment comes from pandagon.net:

Zog showed his 7th and 8th grade parochial school students An Inconvenient Truth. There was a rather heated discussion, where one of his parochial school students openly questioned that God would ever let such a thing happen to us. Before he could sort an appropriate answer through his atheistic brain, the other students took over with a bunch of “What about Noah! Duuuhhhh!”.

Even within their religious frame, these kids had their bullshit detectors on.