Having read your back and forth with Barb, let me pose a few questions that hopefully casts the matter in a different light.
St. John Chrysostom and other Greek Fathers believed the stories literally. That much is fact, because many Romans could not take the Genesis stories seriously, so the Fathers had to address the topic.
Are we in a position to say the faith of the Fathers was defective?
The answer is clear: we are not. Therefore, a literal belief in the stories of the bible cannot be said either to be un Catholic (because it lies within the holy tradition from the Fathers) nor can it be said to be a bad practice, because it was believed by many saints.
Arriving at the next question, why would anyone not believe the literal truth of the bible stories? The answer again is clear. Because modern knowledge and aculturation strongly predisposes us to doubt miraculous stories. This is a cultural marker of modern society. If we appreciate, however, that our doubt does not in the main arise from anything we personally know, but our trust in other “experts” claims about what they have discovered, be begin to see the source of our doubt more clearly.
The Church recognizes the power of this tendency, and therefore does not make literal belief an article of faith.
It is not that she says holding the belief is bad, but because she sees that the power of suggestion and culture is very strong.