Ialways thought Gounod was the Catholic Ave Maria and that Schubert was the one to be avoided.
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Gounod was Roman, so far as I know. And I see no problem with the Schubert, which is just about the modern classical standard setting. Unless it is utter bigotry for anything not written by a professing Roman Catholic, I’m really failing to see the point of excluding great works for liturgical use written by Anglicans or Protestants (not at all the same thing).