R.C. Sproul’s Does Christian Education Compromise Excellence? is a basic, but pretty good little article. I think Sproul’s distinction between “synthesis” and “syncretism” is especially useful in terms of combating the really excessive views of the “antithesis” between God’s Word and God’s world that prevail in some Reformed quarters.
The bottom line is, if you’re going to have Christian education, it needs to be classical Christian education. And if you’re going to say you’re doing classical Christian education, the huffing and puffing about how the really and truly classical approach isn’t “biblical enough” and how we, with our Van Til-enlightened worldview superiority, have managed to figure out the things that those who gave us the classical approach in the first place were too benighted by “vain philosophy” to see just needs to stop.