For R.C. Sproul Jr., "the issue of education is always the heart" and "education is discipleship." Taking his cue from the Great Shema (Deuteronomy 6:4-9), he argues that parents are the only fit (and indeed, God-appointed) educators of their children, responsible not simply to teach them how to read and write but to train their hearts and minds in godliness.
In fact, he seems at times to go so far as to suggest character-development and doctrine are the only appropriate elements of any child's curriculum, and that academic study is irrelevant at best, and at worst pernicious. He's quick to say that's not the case, that academic excellence is a logical result of the pursuit of spirituality, but often his protestations fall flat.
Especially after he sets up a false dichotomy like this—would you rather, he asks, have a child who graduates Harvard at the top of his class to become involved with the Council for Secular Humanists, or one who never finishes high school and becomes a godly garbageman leading his family in virtue and righteousness. Shortly thereafter he hurriedly admits we don't have to make that choice, but why bring up such an absurd analogy in the first place?
Like many statements throughout When You Rise Up, it's hard to say. One gets the impression Sproul wants homeschooling to be right because it's the way he's chosen to educate his children, but doesn't really have a firm ideological basis for doing so. He camps on the Deuteronomy passage, referring back to it whenever he's at a loss, and recycles arguments over and over like an Irishman protesting his own innocence.
There's a lot to agree with here. Sproul affirms that any subject, even math, is objective rather than neutral because when properly taught it evidences God's truth. To a large extent his basic position that education is primarily about raising children with godly character is an excellent position to espouse—we would simply hope that it could be done better, with less dogmatism and more reasonable and Scriptural proofs.