At least on the surface, it has a bit in common with Preacher: horror/thriller genre, some implied supernatural elements, obviously the religious theme and nature of the main/one-of-the-main character.
Tonally they're actually a bit different, Preacher is a super dark comedy, it's vulgar, over-the-top action, visually absurd (and I mean all that in the most positive way
), where Midnight Mass is a slow burn, realistically grounded, it's a drama first, while Preacher is very "comic book-y".
Fun Fact: the main character in Flanagan's movie Hush (starring/co-written by his wife, who's also a star of Midnight Mass), is an author, who's last big blockbuster novel was titled, well, yeah, you guessed it ... Midnight Mass