Or, better: Is a culturally Christian scholar better equipped to understand and translate early Christian texts?
Let me stipulate that “culturally Christian” denotes a scholar who was educated in a Christian milieu and knows Christianity from the inside. She might be more or less devout at the present point of her life. This stipulation is needed in order to avoid deciding about the inner life of people, which is, by definition, imperceptible and therefore undecidable.
Now, a culturally Christian scholar surely has some advantages over a non-Christian one, insofar as she will immediately recognise what is meant by short hints in a text. She will probably also be more likely to apply the principle of charity which —in my humble opinion— is a needed approach to the study of ancient philosophy.
However, a non-Christian scholar will have the opposite advantage, namely he will not try to understand small hints found in the text, because he will not immediately see them against the background of their successive evolution.
For instance, let us take the controversial problem of whether Jesus defined himself as God in the synoptic Gospels. The synoptic Gospels, unlike the Gospel of John, do not contain clear statements in this regard. Jesus rather defines himself as “the son of Man” (ὁ υἱὸς τοῦ ἀνθρώπου). A culturally Christian scholar knows that Jesus is believed to be the second person of God (no matter how sure she is in her faith) and will therefore interpret the ambiguous statements of Jesus in the Gospels according to this knowledge. By contrast, a non-Christian scholar will be freer to think that perhaps Jesus was not at all claiming to be God in the synoptic Gospels.
Hence the question: Given the same degree of scholarship (and assuming that this can be ascertained), should we prefer scholars who are culturally close to the texts they are going to study and translate? In the case of texts which need to be approached by a team of scholars, should we prefer them to be ALL culturally close to the texts?