That's really sad. I knew many kids whose parents were like that, unfortunately. Most went in completely the opposite direction as soon as they were old enough, and who can blame them?
Intellectually repressing your kids is not a good thing. To me, it's much healthier to introduce your kids to controversial subjects in an environment where they feel safe enough to ask questions. Shutting them down and telling them they're bad for having any sort of curiosity about the world is ridiculous.