many have mentioned the correct approach of building critical thought honestly in the kids
also not excluding them from unavoidable society/ school norms
with death of relative, united with the air and trees worked for me, later on to be refined in to the truth of ever-recycling molecules in the troposphere. I contain trees, and great grandmothers and rotten leaves...
certainty , reassurance and self confidence in dealing with the unknown is what children need to see in the parent, so admitting the unknown is an essential step.
i am unfortunate enough to raise 9, 8 year olds in school where they had until recently compulsory religious orthodox doctrine, with a picture of jesus in classrooms
in the question what is this god, where is he? my child posed at me at the age of 7, naturally i gave her my oppinion. she agreed instantly and now she socialises carefree during those classes.
I am happy she pays attention in maths
but if you really want to push atheism in your kids, the protocol requires some exposure to blockhead churchgoers. Like a vaccine it benefits from a challenge with the bullshit bug