That it disproves "history is written by the victors" is one of the most astonishing things about the Old Testament. The Hebrews were emphatically not the victors throughout ancient history and yet theirs are the most complete records we have of the Ancient Near East. Even though they were slaves in Egypt, and even though innumerable pagan empires occupied the Holy Land, God's people therein outlasted all of them. How often do we think about Assyria and Babylon, the most powerful nations of their day, except in the context of how they treated the ancient Jews?
The New Testament can be viewed in a similar manner. The early Christians were mostly poor people: the Disciples were mainly fishermen and they wrote at least four (the Gospels) of the most important and recognized documents in history. Compare them to the Greek and Roman authors. Nearly all the great writers of Athens (Thucydides, Euripides, Sophocles, Aeschylus, Plato, Aristotle, and so on) were born into noble and wealthy families. Likewise with the Romans. Today, people are much more likely to be able to recognize Matthew, Mark, Luke, and John than Cicero or Livy (assuming they'd recognize any of these writers).
The prevailing narrative around the Christians and Jews should have been controlled by their pagan neighbors, but two thousand years later, we find the opposite is true.