Evangelist Ken Ham smiled at the 2,300 elementary students packed into pews, their faces rapt. With dinosaur puppets and silly cartoons, he was training them to reject much of geology, paleontology and evolutionary biology as a sinister tangle of lies.

"Boys and girls," Ham said. If a teacher so much as mentions evolution, or the Big Bang, or an era when dinosaurs ruled the Earth, "you put your hand up and you say, 'Excuse me, were you there?' Can you remember that?"