Disclaimer: This is by no means Christian and not entirely Western.
Some of the Cthulhu mythos are quoted from it (the self-adaptation is relatively large and not very similar to the traditional Cthulhu), and the myths of people from all over the world are quoted, so there are more.
The ascension of the 800th Pope Qiu Lin Yuyun brought prosperity to the world. What is buried under this prosperous age? With the loss of the Holy Stone of Nine Continents, the Holy See is divided, foreign religions are flourishing, and all nations are in chaos, what will happen?