The priest isn't much help, besides being fixated on silence. See what else there is here that you can use.
There's an odd book in the middle of the room on a kind of lectern. Check it out.
It's essentially a collection of anonymous prayers. How very odd. If George Ostin wrote a prayer here, it might help us -- if we knew what his handwriting looked like.
Oh, wait, we do. Remember the note about the clothing drive? (If you don't have it, go back to George's building and have Joey blow the note over to Rosa.)
Use that note on the book to find George's prayer, which gives you another name to go on.
How do I find Lia?