Piper writes [emphasis mine]:
The most fundamental task of a mother and father is to show God to the children. Children know their parents before they know God. This is a huge responsibility and should cause every parent to be desperate for God-like transformation. The children will have years of exposure to what the universe is like before they know there is a universe. They will experience the kind of authority there is in the universe and the kind of justice there is in the universe and the kind of love there is in the universe before they meet the God of authority and justice and love who created and rules of the universe. Children are absorbing from dad his strength and leadership and protection and justice and love; and they are absorbing from mother her care and nurture and warmth and intimacy and justice and love—and, of course, all these overlap.Grace, Paul, Elijah and ? -- May God grant your mom and dad grace to know Him and show Him to you!
And all this is happening before the child knows anything about God, but it is profoundly all about God. Will the child be able to recognize God for who he really is in his authority and love and justice because mom and dad have together shown the child what God is like. The chief task of parenting is to know God for who he is in his many attributes, and then to live in such a way with our children that we help them see and know this multi-faceted God. And, of course, that will involve directing them always to the infallible portrait of God in the Bible.