I think the most important thing is to teach children how to properly discern what can be proven as truth and what must be dismissed as fiction. If they become religious, that is their choice, but at least the chance of them becoming a fundamentalist that believes god created man and earth 6,000 years ago will be minimized.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell