@Am sure we can answer, even from logic point of view.

@jokes, tell your son every created thing has a creator, God does not have a creator. God created all the things we see e.g. sun, moon, stars, trees, water, air, animals, mum, dad, president, kings etc.

If you want a more intelligent, logical explanation, then let me know... Otherwise, you will probably need to keep it simple for your 6 year old son as follows:

Deuteronomy 29:29
It might be important for the young one to know, that God is greater than you. That there are things that only God knows, that only God can give him, that God will tell him if he seeks His face.

Let him know that his very FIRST authority is not you as a parent but God Himself. Then teach him the song 'Read your Bible, pray everydayx3 and you'll Grow, Grow Grow'

Give him the analogy of a glass and the ocean. It is impossible to fit the waters of the ocean into a glass. We are the glass, in our varying sizes, God is the ocean.

To my son at his age everything has a creator. We make cars, make food, (his words), God created us. So logically God was created by some one else. He knows the creation story and to him the concept of God aways being there doesn't make sense to him. To him something just can't exist?

@Jokes

Kids nowadays have lots of questions and they need proper answers from you or they will get a funny one elsewhere.

I love the fact that your kid knows there is a God in the first place.

It's as simple as has been said above, simply say:

"God has no creator and that's why he has been there all along and will be there forever. He was not made by anyone and will not die. He is the only being who has powers to make everything."

He/she will need the bible stuff at some point.

Trust me, I have a 6 year old girl, she will understand the above text perfectly.

Good to see @AlphDoti and @Mukiri representing this. We used to exchange lotsa notes with @AlphDoti back in the day.

@Tommy sorry but these habit of falling back into mystery and saying just believe is what I always try to refute before people get upset with me. You should question those things that do not make sense.