Via Justin Taylor, advice from D. A. Carson on preparing kids for attacks on their faith that they will face in college, or high school, or on TV, or in the movies, or, heck, in a large percentage of Episcopal churches. Of course, I liked this part a lot:
First, the home should encourage vigorous Christian understanding. The most dangerous seedbed for intellectual rebellion is a home where faith is sentimental and even anti-intellectual, and where opponents are painted as ignorant knaves, because eventually our children discover that there are some really nice people who are atheists and agnostics, and they can present arguments in sophisticated, gentle, and persuasive fashion.
First and foremost: know what you believe.