@DeadmantoonsFandom Hi, sorry for taking a while to respond. College and preparing for finals have been hectic. This is a really great and cool idea that you have and one that I haven't seen. I have seen fanfics where Hiccup gets banished and converts to another religion, but I have never read or heard of one where Hiccup becomes the Pope. It's a great idea, and I HIGHLY encourage you and your friends to do this. But ultimately, it's up to you and your friends if you decide to go with this idea.
And when it's published. Do let me know. You got me effectively intrigued on this idea of yours.
Good luck with this idea.
Lizard out.