From what it looks like, the Emperor has long give up all hope already. He is someone that doesn't have anything to lose anymore
That is the reason why he just let the Church do whatever they want. He didn't try stopping them as he is completely aware that that is a useless thing to do
Even if he were to exert all of his effort and power into maintaining his sovereignty, he is still not the protagonist of this world
He was the Emperor but his power would be eclipsed by the church as what fate dictates
Instead of fighting against the impossible, he just let things be and the gears of fate work on their own
However, Reif is sure that the Emperor is a person that was once arrogant, prideful, and confident
The type of person that is extremely ambitious and wants his fate to be in his hands
The Emperor rebelled countless times but all of his attempts all ended up as a big failure