A Religious Conquest

A young man named "Charles" was a heir to a duchy and one day he fell in love with a woman. This woman betrayed him and killed his father, the duke. She became the duchess and exiled Charles to a small village as a Priest.

Charles spent many years there but one night, a person went inside the confession chamber and this person told him he was a god but Charles didn't believe him until he realized this person was actually him.

This God ordered Charles to spread his religion as the prophet, he had no choice but to say yes.