The Hebrew backs it up....but hey, thanks for playing.
And another thing -- the CCC does NOT say that Genesis is symbolic, only that the use of the word "day" to refer to the yoms of creation is symbolic, which is obvious by the structure of the sentence alone. It does NOT say that the act of creation is symbolic, or that the reality of creation is symbolic. To say "Catholics think Genesis is symbolic" is, at best, a massive stretch. But hey, anything to forward the old agenda, by hook or by crook. The end justifies the means, apparently, when attempting to discredit Catholicism.