Everyone struggles with the teachings of Yu Yevon in Final Fantasy X, only it’s not as apparent. The Al-bheds don’t keep the teachings of Yu Yevon and are outcasts in society due to it. But the other Spirans live in a constant fear of Sin despite the teachings.
And everyone who believes is the worst enemy to everyone else. They enable the religion and the summoner’s pilgrimage in order to sacrifice more.
Society abuses Maester Seymour. Everyone lives in oppression due to their adherence to religious tradition. War created Sin and now ravages the land as a force of nature. And Yu Yevon himself, who’s worshipped much like a god.
Society kept religions going. They’re all the villains in Final Fantasy X.