FBF:Experiments have unsuccessfully been done to try to irradicate belief (see Communism), but ultimately it's very much going to be something that everyone is exposed to culturally. It's going to become an issue at some point, even if that's Kindergarten.
Right ... so it's albout being coherent and not saying that you are sure of something when you are not ... (a kid can trust his parent on word - moreover on this kind of stuff it's an whole ambiance) ... the thing is to let the kids think for themself from everything we know in talking about every options and aspects of it ... and let him know that he might find something new himself ... (why not) ... that's how you can make him as open minded as possible.