Children are gifts from God. To parents, children are what people put into their custody. It is the duty of parents to pass down the right morals to their children. The way God entrusts finance to us just like the parable of the three stewards and their response towards their master, that is the same way that God entrusts children to the hands of parents.
Parents owe it to their parents to pass their faith to their children. If a parent believe in their faith then it is reasonable that they pass it to their children.
Proverbs 22:6
Train up a child in the way he should go: and when he is old, he will not depart from it
Parents are a major influence to their children. They may probably come across with many people in different spheres of life but if the parents instill the right culture in them in most cases the won't depart from it. The best time to get to children is when they are still young and not after they most have grown past the independent stage because then it may be hard.