There is another independent movie that is being made that I am looking forward to seeing. It is called IndoctriNation. You can see clips and the trailer here. (They aren't allowing embedding at this time.) This documentary ties the indoctrination of our kids in the public school system to the decline of Christianity in America.
One thing that the movie points out is that there is no such thing as a worldview neutral education. All education seeks to transform the mind not just with straight facts but with ideals. I think many Christians don't want to believe this. They want the broad way, the easy way to be the best way when it comes to education.
I know that people can send their kids to public school and end up with devout Christians. I also believe that this is only possible with intense re-doctrination when the kids are at home.
I also know that some parents have no other choice. But I would say that this number is far fewer than the number of Christian parents that send their kids to public school.