Cult of the Sky

Quick Summary
The Sun, the Moon, stars and planets are gods. While they're all important, the Moon and Sun are the ones which must be paid the greatest respect/tributes.

Beliefs
The Sun and Moon are jealous and petty gods, watching over the world closely to ensure that they are properly revered. If they are not worshipped properly, then crops will fail, the seas will boil and darkness will cover the earth.

Sometimes, the Moon trespasses on the Sun's territory, battling for dominance of the sky (which we see as an eclipse of the sun). The Cult of the Sky believes that if the moon should win (though it has tried and failed several times before), then the world will be ushered into a new era as the moon bends earth to its will.

In some sects, there is a belief that feathered Avions are messengers of the Moon and Sun. There is a further belief that some Avions are actually fallen messengers, who seek to turn the Cult of the Sky away from worshipping the Moon and Sun. Some Avions even lead Cults of the Sky and are highly regarded. Either way, Avion feathers are highly treasured by the Cult of the Sky, either as holy symbols or as trophies. As such, there is a black market for Avion feathers, some of them slightly bloodstained...

Rituals
On the first sunrise of the month, a ritual must be held for the Sun. This mostly involves dancing, a bouquet of plants left at an altar that has been dedicated to the Sun.

On every full moon, a ritual blood sacrifice must be made on an altar that has been dedicated to the Moon. This sacrifice is typically a livestock animal, such as a chicken or goat, but some sects believe that a sentient being's life is more pleasing to the Moon and will grant them the Moon's favour.