Revised and extended:
Not because the New Testament was written in Greek.
But because the writers of the books of the New Testament weren't human typewriters that God used as dictation machines.
The writers of the New Testament received revelation from God, but they also were fully human beings with their own life experiences, worldviews, educational backgrounds, and beliefs, which influenced their writing.
God works with the people who are open to receiving God.
God can work through Plato and through other Greek philosophers as well as through St. Paul, St. Teresa of Avila, Martin Luther, or Mary Baker Eddy. Or Moses, Samuel, Rabbi Akiva, Rashi, or Martin Buber.
I think God gave revelation to all sorts of people, including Buddha, Mohammed, Confucius (the real Confucius, not the Westernized and condensed Confucius), and the writers of the Bhagavad Gita.
Your God is way too narrow-minded to be God.