If they did not have a proper upbringing as children, that's water under the bridge. And even if they did, they may still reject Christ.
The point I was making is that people can join a church and think of themselves as Christians. But they are not taught any doctrine by the church while they are in it, and so many leave. I do not think Ann Rice knew any important doctrine at all, and if she had, she would not have joined a church. She was probably one of those Bishop Spong type of Christians, who think Christianity is only about loving everything about everybody.
Thank you for your detailed clarification. I now understand your point better and completely agree with you.