We have recently become friends with a family who moved into our village. The father, Miles, is a non-practicing, not especially reliogious Jew. We are largely non practicing, not especially religious Christians. After extensive questioning about various belief systems - "so Miles doesn't believe in Jesus, and we do..." - he says: "What if he's right and we're wrong?" Anyone got an answer for that that will satisfy the world's most inquisitorial kid?