In the beginning, when the Potter God first baked the bowl of the Earth and the bowl of the Sky, the world spun in quiet harmony. Then one night Earth dreamt of Fire and her dreams turned the world to ash. On seeing this, the Sky cried Tears that filled the oceans and sent Fire burrowing into the Burning Mountains. And thereafter there was Earth and Sky and Fire and Tears.
Just because, duuuude, a world where rain (and rainwater) was sacred? And it wasn’t any sort of desert planet? And where they avoided fire at all costs? So many nifty things to worldbuild around, and you could have the people in temperate regions believing Fire is bad and those in the colder parts believing Fire is good, but less with the ‘You think Fire is good, you must Die!’ and more of the ‘Ack! Crazy people! Run away and let them be crazy in peace!’ Hehehe
So on one hand you have the people who need rain because of constant forest fires and those that need fire because of the constant freezing rain/snow. … Come to think of it, that’s one messed up planet.