The Solari and Lunari Religions

With the Mt. Targon update coming soon, i got to thinking about one of the few actual religions of Runeterra. Now, it could be most other cultures do have religions its just we dont know about them, but seemingly Runeterra is very aetheist (considering its midevial-Victorian time frame inspiration). What does/did the Solari/Lunari gods do?

In a fantasy setting where gods are actually tangable (such as Nakaburas providing free hentai tentacles to its whorshippers), Leona and Diana do not actually speak of a certain god, they whorship either the actually sun/moon or what they inteript the celestial bodies to be. In our own history, many cultures had given personalties to the sun and moon. We do not know how old Mt. Targon is. Perhaps, in the LoLverse ancient times - during the times when Demons, Elementals, Darkin, prehistoric beasts and the Watchers ran rampant across Runeterra and humans were a fledgeling race - a brother and sister or two lovers defended at Mt. Targon as a last resort for their people. One standing vigil during the day and they other during the night, fending off hordes of demons and monsters until the culture created its own warrior class - the Rakkor - and managed to survive on its own. Thus the saviors became iconized and whorshiped as the sun and moon whos lights still protects the people to this day.

I dunno, just spitballing, but I hope the Mt. Targon update goes deep into a Greek mythology theme.