In the bible there is a lot about parenting, and how important it is to teach your children about God. Nothing you teach them about God is pointless. They aren't to young either to start training them up to know God. I am a parent of a 21 and 19 and 15 year old I started when they were young and I have had some problems with them along the way not real bad ones but problems but I am so happy that I took the time to teach them about God and about his word. So your life isn't pointless. I am not the greatest with words but my heart is understanding.