Known Catholic bands by subgenre:
Elgibbor (Poland) - metal-archives.com/bands/Elgibbor/37693
Fire Throne (Poland) - metal-archives.com/bands/Fire_Throne/52377
Illuminandi (Poland) - metal-archives.com/bands/Illuminandi/15882
Eterna (Brazil) - metal-archives.com/bands/Eterna/3255
Last Rites (Georgia, USA) - metal-archives.com/bands/Last_Rites/3540303264
Of these… Only Elgibbor and Fire Throne (which are both the same guy) are up to the musical quality of comparable secular or protestant bands. Illuminandi is good too, if a bit unfocused. Unfortunately, Thrash is kind of Metal’s flagship subgenre (i.e. Metallica, Dark Angel, Slayer, etc…) and our sole Catholic representative, Last Rites, really kind of falls flat. It’s a one man band, and although he is a fabulous guitarist, the songs are aimlessly wandering all over the place, totally unfocused.
The following are protestant bands whose theology is acceptable in a pinch, and whose musical quality is unparalleled in Metal of any background:
Sacrament (Pennsylvania, USA)(Evangelical) - metal-archives.com/bands/Sacrament/2618
Thresher (Pennsylvania, USA)(Baptist? Presbyterian? Evangelical Baptist?) - metal-archives.com/bands/Thresher/46326
Detritus (Bristol, England)(High Anglican with Catholic sympathies) - metal-archives.com/bands/Detritus/578
Creation Of Death (Poland) - metal-archives.com/albums/Creation_of_Death/Purify_Your_Soul/14196
Creation Of Death may be Catholic. They are from Poland after all. I just haven’t ever been able to confirm their affiliation. The band is now defunct. A word of warning, however; they are quite angry about abortion, as are we all; but angry enough to drop an F bomb in one song about abortion. I’m angry enough to drop F bombs too, but if that offends you, just watch out for it. The lyrics are available in the link I’ve posted here.
Detritus are Anglican, but songs like Taste The Blood imply a belief in the Real Presence, and band leader Mark Broomhead has hung up his bass guitar in favor of the vestments of an Anglican “priest.” He’s soooooo close to coming home to mother Church. If we could bring him home…
There are some Catholic Death Metal bands as well but I typed this all from memory and their names escape me at the moment.
That’s all for now. Enjoy!