atheistic posters on billboards around every corner

Have you ever looked at the posters that are up on virtually every billboard? They might not be formally atheistic, but they certainly propagate a pretty hostile set of values.

As for children, the analogy with drink isn't bad, but I suggest it points the other way. Growing up in a family where drinking in moderation is part of the way of life is a better preparation for handling it in adult life then keeping it at arms length until you are suddenly exposed to it, and get overwhelmed by it.

The same can be true with religion.