My DD is 6.
She has become increasingly more religious in the last year. She attends Rainbows and Sunday School (at her request) and she loves both.
I think she understands that beliefs are individual and that not everyone believes the things she does, and she is happy to share her own beliefs. She has started to get interested in Dinosaurs and Space, and became really upset when learning about the creation of the universe as it doesn't fit with what she believes.
DH is Atheist, I am Christian but only attend Church semi-regularly and I just don't know how to handle it. I can't answer the questions she has without upsetting her. She is bright and articulate so its not explaining it on a level that is the problem, its knowing what to say.