Some terrible reactionary super-Catholic church, of course. Latin hymns are the best hymns.
Or, more to the point, whoever's most likely to perform this, which despite the composer's Lutheranism is going to be the Catholics.
That is exactly the sort of thing I would like to hear in church, were I a believer. I also really like choral music, and I get the impression that the very high-church Anglicans tend to have the best scene (? I could be
way off base), though I'm not sure if that's ever performed during services.