You need to read this page and learn more. Finally, if you don't think it matters where your kids are educated, then your not misinformed - you're deluded. Your children are too important for you to be indifferent. This page will help you get interested in your children again. I agree that Christian schools can teach biblical principles, but they fall way short of what parents can do on their own.
Institutional schools are a relatively new phenomena.
Historically, most education has been done in the home. George Washington, Abraham Lincoln, Albert Einstein, and many other great men and women of history were taught at home. Most people are surprised to find out that in the United States, literacy among the general population has been declining steadily since education went from being done in homes to being done in government-controlled institutions. Home-schooled children go to Harvard, MIT, state universities, Bible colleges and seminaries. Most universities are happy to have these children as their students.