Became the Only Believer of the Evil God in the Theocratic World

A weird dream brought me into a world with "gods". And a parchment in my hand could actually communicate with the evil god, but this also became the reason why I was labeled a heretic by the Holy Church. An experience in entering a foggy area revealed that God is just a self-respecting existence that feeds devils. This secret completely put me and the divine authority on life-and-death opposites.