I got summoned to another world as the apostle of god

kenji, a psychology student, never believed in existence of god. For him, Gods were merely ideas created by high society in past to keep commoners under their thumb. On one fateful day, his entire class was summoned to kingdom of Grumania. It was a theocracy, his worst nightmare. But to add salt to the wound, the gods these humans worshipped made him the apostle!?