@wotad ascendence of a bookworm is both a novel and a manga.
Though I wouldnt say the church is pure there, the church is simply part of every day life. But it isnt like a religious thing, its like worshiping physics.
The ones who run the church are nobles, but the church is at the bottom of power and those who become priests are usually nobles disowned by thier family for having too little magic power. The church role is citizenship and food management like a government agency.
But to cast spells be it attack or defense you need to pray to gods. So gods are more part of nobles every day life, and merchants use gods as a habit of dealing with nobles. And farmers need to prey to get blessings for their fields from the noble priests. But commoners are completely clueles about the gods. They only deal with them 3 times in their life, 7 when they become citizens, 15 when they become adults and when they marry. Other then that they stay away from the church.
So far there hasnt been shown a single religious person even amongst nobles, its mostly just part of their lives.