I don't think this is true in general. I have a pet theory that much of the conspiracy theory following we are seeing is actually a weakening of church. People need spirituality - it doesn't matter where that spirituality comes from (except for local social pressures - but those aren't relevant to this point). If they're not getting spirituality from church, it has to come from somewhere. So people latch on to conspiracy theories because it provides higher purpose in their lives.
If you are teaching your children to be good and to not fear death, you need some philosophical backbone with which to unify these ideas. You may well be able to provide that, but not everyone is. Religion serves as a common philosophical substrate for discussions that people don't know how to have. It is imperfect, and definitely not as good as thoughtful parenting in my opinion, but it fills some of the gaps.