To quote Voddie Baucham, from my post Are your children in government schools?... (and if you haven't watched the video at that post - do so. It's excellent.)
"When you send your kids to Caesar for their education, don't be surprised when they come back as Romans."
Matt, over at Conservative Hideout, gives you more reasons that homeschooling may be your only reasonable choice.
Head over there and listen to what Melissa Harris-Perry has to say about your children.