If it did, what would you tell him?
I think telling a child that we're all just here until we die is burdening on them. The best thing is to tell them you don't know and that's it.
I really wonder what would happen if they did some kind of experiment to raise children on an island cut off from society and never mention God or anything supernatural about life.
I don't have kids maybe in a few years.
What you're doing is right. You could argue anything at a young age is considered indoctrination. Honestly, I think being told about God or heaven is life changing. It's hard to shake off after you get older.