All creatures in the world have their own gods. When everyone reaches the age of 9, they can choose their own soul, become a believer of gods, and possess the power of the source spirit. However, there is only one chance. If you fail, you can only become an ordinary person.
God relies on source spirits to protect his believers. The more believers there are, the more source spirits there are, and the more power they have to protect them.
Believers can also get the chance to become gods, but if the god dies, the source objects and source spirits will disappear.
Concept: Butterflies and Angels