Featured May a Baptist sing Catholic hymns?

There is an essential difference between accepted hymns by RCs which have been in our hymnbooks for generations and "worship songs" by influential living writers who may include sound doctrine in some songs, but teach error.

 

If we applied the "preached in error" test, our hymnals might be pretty skinny. Haven't we all preached in error somewhere along the way?

 

Yes, but some do intentionally.

 

Some pedantry: Those "two" Ave Marias are but one, as Gounod laid the words atop the C-major prelude from Well Tempered Clavier #1. The other well-known Ave is by Schubert. They're both beautiful listening (though I prefer the prelude by itself) but I would sing neither due to the mariolotry.
As others have posted, it's not the authors but the lyrics that count - are they doctrinally sound? And is the song/arrangement honoring to God. (There's liberty for different tastes there,) The one exception I'd make would be an otherwise acceptable song written/sung by one who has a notoriously bad testimony, as that might cause a brother/sister in Christ to stumble. If that bad testimony occurred 150 years ago, I'd have no problem with the hymn.

 

God’s will is done unknowingly even by those who oppose.