I prefer to raise little heathens. I tell them it's their job as people to figure out what they believe about god, and that they don't have to decide anytime soon. And I try to protect them from high pressure religious sales tactics. When they ask, I tell them what I don't believe and what I just don't know.
I do try to teach them what's appropriate when someone wants to pray. And that its rude to go around telling friends and family that there is no god in an unprovoked way, much the same way as it's rude to tell kids that there is no Santa Claus. It isn't their place to create rifts that way.
I have a step-son who is hanging out with a Jehovah's Witness family. We are really hope he doesn't get into that too deep.
Yes, raising well-mannered little heathens was my goal as well. And promoting the idea that this world is filled with many people with many paths to follow...like you said, they don't have to decide anything yet....we are each a work in progress. Having strong opinions is fine but not pushing others to agree or to hold those same opinions.
I don't know about anybody else but I was raised a Lutheran and I played with all kinds of kids never knowing what their religion was...it just wasn't an issue that was brought up or talked about much. Even in high school. Well, in middle school I was fascinated with the 'holy rollers' as we called them....I didn't even know what that meant but we could pick them out in a classroom by the way they dressed.
But that was 30 years ago for me! It wasn't until university that the idea of atheism even hit me...that people didn't always automatically belong to a religious group or believe in a god/supernatural being. So hanging out with somebody who's a member of the JW's or whatever....does it really make long lasting impressions on a child/teenager? It's hard to predict.