But what part of the creed isn't biblical?
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No part of any creed is Biblical.
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The 1962 Roman Catholic DAILY MISSAL, p.21 of the Creed, says about Christ, "He descended into hell,"
Big controversy on this disputed statement. It doesn't say in the Bible that he descended into Hades, or Hell, anywhere. In fact that line doesn't appear in early versions of the Creed either. Versions after 650 A.D. include it. For what it's worth, I believe it to mean he died.
I have always had questions about the "died, and was buried," part. Wasn't Christ lying in a tomb, covered in a shroud, with a large stone rolled over the entrance, protected by two guards? Why the "buried" statement? "Buried from sight" perhaps, rather than placed in a hole covered with dirt?
Proper thing not to recite it, I don't. But I assure you I believe all its overall statements of the faith.