What was Father Francis' sin?

No, it's not a joke, or it would be funnier, or at least I hoped it would be.

He's sitting in bed with Cheche, and he hears the word, "Sua Culpa" in his ears. He jumps up and says, "You know my sin?!"

Unless you're talking about the other film, in which case, they use a different Father Francis, and I don't think it was there.

I thought it was a very important part of the film, as he hears it in his dreams as well.

And right before he dies (I think), he tells Merrin he needs to confess.

It was never made clear what his sin was. They probably left it up to the imagination. Therefore, I'm wondering what "sua culpa" means.

Clear enough?

It's like watching a bunch of retards trying to hump a doorknob out there!
Dodgeball

If I may suggest...Fr. Francis' severe wounding is iconic of "The Martyrdon of Saint Sebastian" -which is (for whatever reason) also used as a gay image, so the suggestion is that Father Francis may have been a closet case

"If you don't know the answer -change the question."

Just guessing, but demons are liars....they play on one's weaknesses....Does anyone might think that his "sin" was choosing the people to die in Holland? Maybe? I mean come on.....a closet case? Sheesh!