If you're talking about that slick pop gospel stuff, I'm with you.
But the REAL old-time music - the Sacred Harp, Southern Harmony, Kentucky Harmony, etc. - is perfectly appropriate for a Catholic Mass. It's traditionally sung a cappella, the texts are usually scripture or a paraphrase, and the music is based on classical fugue models. It had its origins in the New England Singing School composers - Billings, Justin Morgan, etc. - and that old style was sort of preserved in amber in the rural South.
We actually sang a Billings anthem on Good Friday once.
Glory and Praise music was much of what we played back in the 80s...VERY liturgical and musical...we had guitars and other instruments, but our purpose wasnt to be a rock group...just provide good music. I loved a lot of the Glory and Praise music.
AAM, the more I troll these threads the more in awe I become of your musical knowledge. :)
Now, of course, I'm going to have to look up these styles you mention!