Billy Joel knows about God, but he is human. Remember, Jesus died for our sins, but that does not mean we take HIM for granted. People who know God are not afraid and they hand everything up to GOD. That does not mean we all don't slip. Good and evil is a constant battle. Encourage more Faith in our children and as much as possible find the lesson to be taught in as much as you can. Open your mind so they will have a more open mind.