Have you ever seen a Catholic hymnal? It’s full of hymns written by Protestants. The next time you are passing by a Catholic church stop in and flip through the one. If you know Spafford you’ll probably recognize dozens of other Protestant hymn writers.
I know some very traditional Catholics and they would all prefer a well-written, beautiful Protestant hymn to pretty much anything written in the decade after Vatican II. But maybe that’s because a high proportion of them are former Protestants.
By the way, protestant hymnals also contain many hymns written by Catholics (cf. The Episcopal Hymnal of 1940).
I understand. I was referring to those who do not (no Protestant song or hymn should ever be sung in a Catholic Church), or who (like Michael Vori) even think Amazing Grace should not be used. -