En arche en ho logos. You tell me where that "logos" came from.
Logos was a word used by the Greek philosophers and St. John got that word from them. But he did not fill his Gospel with Greek philosophy. Similarly, homousios is found nowhere in the Bible but it is found in the Greek version of the Nicene Creed. Does that mean the Nicene Fathers adopted Greek philosophy? It does not. In fact, the Church still condemns Greek philosophy as being foolishness.
Even after Augustine employed reason in his writings, mainly the philosophy of Plotinus, the West did not go ga ga for Greek philosophy. We don't see the West really coming unglued until centuries later. Are you familiar with early 12th century war between Abelard and Bernard? It is in that war that we see reason gaining the victory over Tradition. But the seed was planted by Augustine.