My oldest daughter asked me when she was 4 or 5 whether I believed in God. I explained that there were two basic beliefs about the origin of man. I explained evolution and man's evolving from just a single cell through primate stages. I also explained the basic tenets of Christian beliefs starting with Adam and Eve and the garden of eden and Jesus and etc.
When I finished she asked, "What do you believe?" I responded by throwing the question back at her, kinda like "you first". Her exact answer was "That man came from monkeys, of course".