Sekai de Tadahitori no Mamono Tsukai ~Tenshoku Shitara Maou ni Machigawa Remashita~ - Vol. 9 Ch. 43.2

[Rantroper]

That... doesn't exactly make sense. If the god of that world is a culmination of humans conceptualization, then to convince the public that God is a deity named Muller would not turn the existing Muller into God; it would turn God into a new Muller.

But even that is wrong because the concept of Muller to the average human  is God, so it would be turning God into "God, but His name is Muller now."

The only way the pope gets his demon god is if he allows the information that Muller (who they perceive as God) is actually the demon lord to take root in the minds of the people.

If it turns out that the whole "Muller is slowly turning from a demon lord into a god because people think that Muller is God" monologue is a lie and that letting the fact that "Muller is the demon lord" leak to the public "by accident" is the real final step of their plan, then kudos to the writer.

 

[PrivatePublic]

The Pope may not be overly concerned with what kind of god Muller becomes so long as he is still the highest secular authority of Muller's religion. The Pope maintains what power he currently has and pushes it further as more people convert, regardless of any "magical" effects the transition may have.

Perfectly reasonable logic behind it. RL religions have done (and still do) such things.