The Amari faith is a complex one. To an outside observer, there appears to be no order, no leadership. But that would be false. In terms of religious leaders, there is a strict hierarchy in which high priest and high priestess are at the top. And in relation to gods, there are a vast array of greater and lesser deities.
The Amari believe there is a god for everything. One for water. One for rivers. Even one for a specific river. The greater scale of what the god represents, the greater its responsibility, and thus, the greater its power.
When an amari dies, he ascends and becomes a god. His life dictates what he shall represent.