Augustine and Aquinas are not Christian in their writings or views.
They are Platonist and Aristotelian. In Aquinas'
case, the summa was written in response to ( as academics do when replying to others in their works) Averroes, an aristotelian islamicist scholar...
it uses greek pagan concerns, the greek type of exegesis, and all the replies within it conform to the platonic
greek pagan theology. As for Augustine, his book De Trinitate and other texts as well conform to Aristotle and Plato.
I do know that Catholic universities are "Augustinian", at least some, as I taught ancient and medieval theology and philosophy at one for years. And what I just wrote is true, whether lay catholics know it or not.
Every single point in Augustine and Aquinas conforms to Platonic pagan theology. Many bishops and former clergy of the catholic church confirm it. Not even a secret!!