A. You first connected me to people I never heard of.
B. If you want to talk Augustine, here's an actual quote from him:
No one will sat that "free-will" actually vanished from the human race because of the first man's sin. Yet it is true that sin robbed mankind of "liberty," the liberty that existed in Paradise - that is, the liberty we can define as "perfect righteousness with immortality."
That is why human nature stands in need of divine grace. So the Lord says, "If the Son sets you free, you will be really free" (John 8:36). free for a good and righteous life. Even so, free-will has not entirely perished from sinners; for fre-will is the power by which people commit sin! This is especially the case with all who delight in sinning and love their sin; they choose to do what pleases them. The apostle says, "When you were the slaves of sin, you were free from righteousness" (Romans 6:20). It is clear that people can only become "slaves of sin" because they are in fact free; for the thing that makes people "free from righteousness" is their own sinful free choice! By contrast, however, the only thing that makes people "free from sin" is the grace of the Saviour. The admirable teacher Paul makes this very distinction: free from righteousness - set free from sin (Romans 6:20-22). He says "free" from righteousness, but "set free" from it. He deliberately uses the phrase "set free" in harmony with the Lord's statement, "Iff the Son sets you free." For the children of mankind cannot live a good life unless God makes them into His children How then can Julian of Eclanum try to pretend that the power to live a good life comes from our free will? Only God's grace gives this power through Jesus Christ our Lord.
{Augustine of Hippo: 'Concerning Two Letters of Pelagius,' chapter 1, sec. 5]
You may disagree with this extract, but it is not Manichaism or Determinism or Gnosticism..