Yes, this. I'm convinced that people keep forgetting there are intelligent, liberal, religious people because we aren't the type to go on crazy rants or do obnoxious shit that gets put on the news.

Yes — the old correlation vs causation issue. This is probably more likely indicative of parents who're generally open minded, educated, empathetic, and adept critical thinkers; it doesn't necessarily mean that atheism/humanism/secularism is the cause of those other desirable traits.