I’ve always been open about my own journey and interacting honestly and respectfully with my grandchildren (10-26) whenever they wish to talk. The only person in our family who is terribly defensive is a daughter-in-law with southern evangelical roots and the entire family tiptoes around her when she is present. Interestingly, her two sons have quietly abandoned her worldview and talk to me about philosophical ideas.

The truth

Absolutely nothing. Zero .

All I really ever tell anyone is that I'm not a participant mainly as all religions hold the same amount of evidence to support their claims.

Nowt, I think they probably know anyway, but its isnt my place as I see it to have that conversation with them .

Mine are already grown and were agnostic before I was.

No kids, or grandkids, but lots of nieces and nephews. The older ones know I'm an atheist.
The younger ones will learn that as they get older.
If I did have kids of my own, I'd have raised them to know that no gods have ever existed, and
ALL religions are a scam. I don't believe in that whole "raising them to choose for themselves" bullshit. I wouldn't want my children to "choose" to believe in fairy tales. Period.

My four grandchildren are all via my one surviving daughter and her household is atheist anyway. They have discussed religion and [a]theism with me from as young as 8 years old (they currently range from newborn to 15). They are already on the same page as me, but I have been ironically most helpful to them in understanding why people believe, which they found genuinely baffling. My daughter was never a praticing Christian like I was, and I have some theological training in fact, so I help them get inside the minds of their peers in an empathetic / compassionate way so that they don't just turn it into an us vs them, tribal sort of thing where they regard them as, en masse, mindless knuckle draggers.

Of course I don't sugar-coat the unseemly, impertinent, disrespectful nature of theism, particularly where they live (the South, and the Bible Belt) or the deliberate intellectual suicide that's involved, but I try to humanize believers and make then relatable. After all, they need to get along and teens are arrogant enough without developing the notion that they should treat someone with contempt, even if their beliefs are contemptible.

I have always taught my kids to make their own decisions, whatever the path they decide to take, I am behind them 100%. BTW, 19 y.o. twins and both atheist

I tell them what I believe and what other believe. I encourage them to learn about all of the things and then we talk about it. We are raising them to be free thinkers. I would like them to make their own minds up about religion.

Didn't tell them anything until they were old enough to understand that they will be given the opportunity to explore, discover and choose whatever they will like. They can choose any belief system (or not have one) and I am OK with it as long as it is their choice and also I always expect from them the same treat, do not tell me what to believe

No grandchidren. My daughters were raised non-religious by me.