@I think I have a problem
Seems like Pope is the reason MC and his lover was seperated when MC arrived to this world after they both died. Because he said it was a mistake to seperate them. This means, at some point MC and his lover wasn't seperated, which means the Pope probably did whatever he did before in the past, which is proven when he said rewrite once more. Pope has probably "rewritten" the world more than just these 2 times. Not sure what his end goal is exactly but his power also seems similar to MC's with the whole book angle to it.
Makes me think Pope may be an otherworlder from earth too and was an author like MC potentially.