Great question, OP!
I'm a little drunk at the moment, pardon me if I say something silly or offensive. But anyway, as an atheist, I've taught my little girl (she's 7yrs old) about a few religions and it usually goes like "some people believe [this]" and "some people believe [that]" and that its up to her to believe what she wants. As she forms her belief system, I will ask her why she believes the way she does.
Ultimately, I aim to teach her to make her own choices and to think critically. I feel a person should be able to justify their own beliefs, as well as examine them and change them in light of new knowledge. If you are unable to admit error, and your beliefs are sancrosanct, then you are a joke and so is your belief system...in my humble opinion. I also feel that indoctrination is abuse and that kids should be given the chance to make their own choices.