Journey to the West: What Do You Mean I'm a Princess's Consort and a Pope?

Where is this place? Journey to the West I actually became Liu Hong's younger brother, the same Liu Hong whose son would kill his father and claim his mother. But Liu Hong is still my elder brother, so I can't just leave him to die. I have to change his fate. From then on, the Tang Empire gained its strongest imperial son-in-law, as well as a Church of the God of Light. Buddhism: Buddhism is flourishing, so why do I have fewer and fewer followers? Li Shimin: My emperor has less clout than even a cardinal in red. Jade Emperor: Why are there more gods in the mortal realm than in Heaven? Bull Demon King: My son Red Boy is exceptionally gifted. I want him to join the Church of the God of Light. Protagonist: Those who believe in me will gain eternal life, my followers!