This is a paraphrase of something my friend Lance's dean said in their theology class at his Lutheran seminary. The man who said it studied under Alister McGrath and is an expert on Theodore Beza and "Protestant Scholasticism". I think it is a very true when it comes to Historical Theology.
I've been a Reformed Christian (for a short but happy time) and I've used Romans 3 and 9-11 to justify everything.
I've been an Anabaptist (Arminian) and used 1 Timothy 2, and 2 Peter 3:9, etc to justify everything.
I'm currently a Roman Catholic Christian and use Matthew 16 and 1 Tim 3:15 and 1 Cor 11:2, etc to justify everything.
I've been an Anglican and used my Refomed and Catholic prooftexts to justify that as well.
This is why I want to study St. Augustine, because I don't even know what to believe anymore, theology has just become an assortment of prooftexts that are crammed into a system created by a dead 16th century person. Then you name yourself after them and attack other people with different dead men.
So my only option is to find the right dead man. And everyone's dead men seem to agree that St. Augustine of Hippo was the best dead man, so I want to study him.