St. Augustine is absolutely right. It's hard for us to take Scripture literally, especially modern Catholics who've been fed a steady diet of Darwinized drivel. Check out catholicfundamentalism.com for a theory that's actually new: God can program in three dimensions. He programmed the universe, exactly like Genesis said, in six days maybe ten thousand years ago. catholicfundamentalism.com develops that theory, and makes sense out of everything. Now, we can believe Scripture, and Augustine's telling us to believe it all.
The miricle of the water to wine in Cana has an oft overlooked sub-point.
God can make things 'old'. Good wine needs time, but it was created in an instant.