God
If you're over the age of 10, even if you dont agree with it, you can at least think about the possibility that god was put in books or in drawings/paintings by people, and that people were not put here by god. Your ancestors are where you come from.
God never ceases to be amazing or interesting to hear about, it's a universal topic to most religions and is even outside religion, but it's also a topic humans are fully capable of imagining, a kid can do it.