Bluesteel Blasphemer Series by Ichirou Sakaki

Yukinari Amano loves guns. After reincarnating into another world, the young man goes on a journey with Dasa, the younger sister of the girl who gave him a second life. However, while on the road, the pair are attacked by a local deity—an "erdgod... moreYukinari Amano loves guns. After reincarnating into another world, the young man goes on a journey with Dasa, the younger sister of the girl who gave him a second life. However, while on the road, the pair are attacked by a local deity—an "erdgod." No normal person could possibly defeat one—so when Yukinari uses his knowledge of guns and newfound abilities to do the impossible, he becomes worshipped as the area's new god himself!Get ready for an alternate-reality, gun-and-sword-filled, action-packed adventure! less

In Friedland, there’s a new god in town: Yukinari Amano, who now keeps the area safe from the terrible creatures that routinely attack it. In hopes of raising Friedland’s standard of living, Yuki decides to open trade negotiations with another village. However, this seemingly simple task leads to a shocking discovery: a human-erdgod symbiote! And as if that weren’t enough, a monstrous new threat is bearing down on Friedland while Yuki is away.. moreIn Friedland, there’s a new god in town: Yukinari Amano, who now keeps the area safe from the terrible creatures that routinely attack it. In hopes of raising Friedland’s standard of living, Yuki decides to open trade negotiations with another village. However, this seemingly simple task leads to a shocking discovery: a human-erdgod symbiote! And as if that weren’t enough, a monstrous new threat is bearing down on Friedland while Yuki is away... What will the village do? It’s Volume 2 of the smash-hit guns-meet-swords action-fantasy, Bluesteel Blasphemer! less

Yukinari has created a viable system of agriculture for Friedland, and the town once reliant on their erdgod's whims looks like it might finally be able to thrive on its own. Yuki seems content to settle down at his sanctuary along with Dasa, Berta, and Ulrike, the erdgod from Rostruch, when a unit of the Missionary Order arrives in town with mercenaries on their heels.