When a child asks if the "tooth fairy" is real, they are questioning what they believe. It's very refreshing that my daughter has only asked if the "tooth fairy" is real. She has never asked that about God or Jesus. My wife and I, along with her school and church teacher/ leaders must be doing something right. Do you know what you believe? Figure it out so you know the answer before you get asked. After all, it's the right thing to do when it models the way for others.