The Jewish concept of Messiah was not rich enough in associations for non-Jews to power a Gentile religion. The word was retained in translation, but it needed and received a new mythical content. Jesus gained universal significance as the hero of a salvation myth at the expense of losing his Jewishness. But the cosmic struggle envisaged by the myth needed to be embodied in the details of the story.
If the divine Christ defeated cosmic enemies, the human Jesus must have had to face human enemies. Of course, he did, in the shape of the Romans. Why did the mythicized version of his story not cast the Romans as his primary enemies? A precritical or fundamentalist Christian might reply that historically it was in fact the Jews who encompassed his death because his religious claims challenged theirs. We have seen good reason to disbelieve this explanation.
The New Testament naturally does not draw aside the veil behind which the transformation of history was effected, and we have to speculate on the motives of those who managed it. As we have seen, the most likely explanation is connected with the movement of Christianity out of Judaism into the Roman world.
On the one hand, the new movement was rejected by Jews, so that it must have seemed natural to think that the Jews had rejected Jesus beforehand. On the other, the Church needed to make its way in a Roman world where the Jews were less popular than they had been in the past and would later be again. Deliberately or not, they began to tell the story in such a way that the Romans would look better and the Jews look worse.
Now the human embodiment of the cosmic struggle between Christ and the forces of evil becomes Jesus on trial before the Sanhedrin, driven to his death by Jewish blood-lust and fanaticism against the ineffectual resistance of half admiring Rome. Now the Jews have become the enemies of Christ and finally the Christkillers. In late strata of the New Testament, the charge became explicit.
In what is probably a late interpolation into the earliest surviving Christian writing, the first letter of Paul to the Thessalonians, we read that the Jews “killed the Lord Jesus” a patent falsification of the history recorded elsewhere in the New Testament. In the Fourth Gospel, Jesus is represented as telling the unbelieving Jews that they are the children of their father the Devil, not the children of Abraham, still less of God, as they believe they are. The new myth is now inseparable from profound hostility toward Jews. (pp. 128-129, Christian Antisemitism: A History of Hate By William Nicholls)

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