Reading the headline, I expected this to be about Death to the World, a zine put out by former punks (and a founding member of Sleep) in an Orthodox monastic order.
Orthodox, not Catholic. But yeah, Batushka is awesome.
Then there’s Reverorum ib Malacht, the Black metal band who studied Catholicism so intently in order to make even more evil, sacreligious music, that they actually ended up converting.
http://deathtotheworld.com/about/