Darwin showed that material causes are a sufficient explanation not only for physical phenomena, as Descartes and Newton had shown, but also for biological phenomena with all their seeming evidence of design and purpose. By coupling undirected, purposeless variation to the blind, uncaring process of natural selection, Darwin made theological or spiritual explanations of the life processes superfluous.
-Douglas Futuyma's Evolutionary Biology p. 5
Other than demonstrating that you believe Futuyma is the final word on the subject, what's your point? He doesn't address Augustine at all, he just casually announces that Darwin makes theological explanations superfluous. In logic that's called asserting your premise, one of the more simplistic of logical fallacies. Next time try to find an argument that actually addresses what Augustine wrote and its connection with evolution.