I missed the god discussion Well I'm still writing my idea:

The overdeity made a rule (like a father saying his children may not steal each others stuff) that the gods weren't allowed to directly interfere with other gods worshipers (they can make burning bushes and chat with their own but not others) and that their worshipers got power by acting close to their gods philosophy (war god then fight, forest god then protect the nature and plant a tree) in this way they couldn't just force weaker gods worshipers to worship them, they had to hope their own was good enough