I've seen "Jesus Camp," and the new HBO documentary, "Friends of God" (can't help thinking the acronym of that one is sadly ironic). They deeply depress me, but I'm not in favor of a government crackdown on religion. Frankly, such a notion is not only unconstitutional, but completely impractical.
While I wish people weren't so irrational as to believe in sky daddies, ghost whisperers, astrologers, faith healers, creationism, and fortune cookies, I have to acknowledge that there is enough slack built into modern society that such beliefs don't generally diminish the quality of life for the believers. If it brings them a sense of community and a support system, that may more than compensate for the delusion that evolution is a lie. One's position on evolution is irrelevant for most paying occupations these days, like it or not. The fundies who home-school their children that evolution is a lie, but you need to be able to repeat some of those lies to have your education certified, have probably not done the children any irreparable harm.
I think that as long as we can keep "teach the controversy" out of the public schools, I'm willing to let the evangelicals with 12 kids teach them nonsense. It's not a perfect system, but I have more fear of a government that could eavesdrop on dinner conversations to the extent that it could enforce a "no religious instruction" law than I do of a few (or a few million) people who mock evolution.
Yes, it's true that the vast majority of them, upon reaching adulthood, are beyond the reach of reason where reason conflicts with faith. I think it's also true that a person can be irrational enough to reject evolution without seriously considering the evidence, and still be able to ring up my purchases at Wal-Mart, or even design a bridge that won't fall down.
Bottom line, I think the best course is to oppose them with facts and reason rather than legislation.