Arbour and Blount argue that Open Theists just assume that the church fathers rejected face value readings of the Bible in favor of Platonism. From The Camel’s Nose: Open Theism and Biblical Interpretation – Benjamin H. Arbour and Douglas K. Bloun:
Now Adolf Harnack and Wolfhart Pannenberg not withstanding, we doubt that the tradition’s interpretive approach has been as heavily influenced by Greek philosophy as open theists suggest. Sadly, however, we cannot entertain open theists’ arguments to the contrary for the simple reason that they have put forward no such arguments.21 That traditional Christian readings of scripture have been unduly influenced by Greek philosophy is not a conclusion for which open theists argue but rather an assumption from which they argue. So, for instance, Sanders—who proclaims the point persistently and pointedly—does nothing to show that the tradition has been so influenced; he also does nothing to show which Greek philosophical doctrines are problematic for Christian theology, not to mention why they are so. Apparently, he takes the point to be beyond dispute; it is not.
Arbour and Bloun might be unfamiliar with the extent of documentation of the early Church’s reliance on Platonism. Augustine, the most influential Christian writer, literally stated that he believed the Bible was absurd before Simplicanus told Augustine to read the Bible in light of Plotinus. Augustine admits it plainly. This is in the same work which Augustine shows utter contempt for those who read the Bible on face value:
6. I rejoiced also that the old Scriptures of the law and the prophets were laid before me, to be perused, not now with that eye to which they seemed most absurd before, when I censured Your holy ones for so thinking, whereas in truth they thought not so; and with delight I heard Ambrose, in his sermons to the people, oftentimes most diligently recommend this text as a rule—The letter kills, but the Spirit gives life; while, drawing aside the mystic veil, he spiritually laid open that which, accepted according to the letter, seemed to teach perverse doctrines— teaching herein nothing that offended me, though he taught such things as I knew not as yet whether they were true…
Notice, the Bible was “absurd” to Augustine during his face value readings. And what was absurd? In Chapter 11, Augustine mocks those who think God is in time and spoke as Jesus was being baptized. In Augustine’s commentary on Genesis, he does great damage to the text. Augustine makes the “original sin” as sex between Adam and Eve, as well as other affronts to the face value reading. As soon as Augustine was given license to reinterpret the text spiritually, dumping the face value reading, that allowed him to convert to Christianity.
26. But having then read those books of the Platonists, and being admonished by them to search for incorporeal truth, I saw Your invisible things, understood by those things that are made; [Romans 1:20] and though repulsed, I perceived what that was, which through the darkness of my mind I was not allowed to contemplate,— assured that You were, and were infinite, and yet not diffused in space finite or infinite; and that Thou truly art, who art the same ever, varying neither in part nor motion; and that all other things are from You, on this most sure ground alone, that they are. Of these things was I indeed assured, yet too weak to enjoy You… Upon these [books by the Platonists], therefore, I believe, it was Your pleasure that I should fall before I studied Your Scriptures, that it might be impressed on my memory how I was affected by them… For had I first been moulded in Your Holy Scriptures, and had Thou, in the familiar use of them, grown sweet unto me, and had I afterwards fallen upon those volumes, they might perhaps have withdrawn me from the solid ground of piety; or, had I stood firm in that wholesome disposition which I had thence imbibed, I might have thought that it could have been attained by the study of those books alone.
Notice, Augustine praises the books of the Platonists. Augustine then says his Platonism made the Bible repulsive. Augustine then says that once he used Platonism to understand the Bible, he accepted the Bible. And to top it off, Augustine runs a hypothetical: if Augustine first accepted the Bible and then came across the books of Platonism, Augustine would have converted away from Christianity to Platonism. Christianity, Augustine explicitly says, is Platonism plus charity.
In Confessions, Book 8, Simplicanus lets Augustine into a secret: All the Church Fathers were engrained in Platonism. Simplicanus told Augustine that all Augustine needed to do was import Platonism into Christianity to make Christianity believable:
But when I mentioned to him that I had read certain books of the Platonists, which Victorinus, sometime Professor of Rhetoric at Rome (who died a Christian, as I had been told), had translated into Latin, he congratulated me that I had not fallen upon the writings of other philosophers, which were full of fallacies and deceit, after the rudiments of the world, [Colossians 2:8] whereas they, in many ways, led to the belief in God and His word.
When Arbour and Bloun claim that it is only assumed that the Church Fathers read the Bible in light of Platonism, they are very mistaken. They might be unfamiliar with Early Church writings, but it is not a contested point. It is well documented that not only were the Church Fathers hardcore Platonists, but that they would reject Christianity if they believed the face value text of the Bible. Platonism was their mechanism to conforming Christianity into something they could accept. This is not assumption (as Arbour and Bloun label it); it is explicitly stated in essay format by the Church Fathers.