Whether you shelter your kids through homeschooling or some prestigious Christian academy, or allow them the ups and downs of a government institution, your children will sooner or later face tough questions about their faith. Praise God for such times: Lord willing, and if you've prepared them for it, these times solidify your kids' faith.
How do we do that, though? D. A. Carson answered this question in Ligonier's Tabletalk mag, and you can read it on Justin Taylor's blog.
Once again, we are reminded of the importance of allowing the gospel to affect the whole person, transforming our home life as well as our conversations with our children.