Well Jewish history is of course much much older than Christian history. Some, but not very much, of Jewish history is commonly held as the foundation of Christianity.

It's also worth pointing out that Jewish history is both the history of a people and of a religion, and while they overlap a lot, the history of the people is bigger.

Christianity as most of us know it developed mostly independently of Judaism after the destruction of the temple. There was a divide that formed fairly quickly between the Jewish and gentile followers of Christ. You can see this happening in the New Testament in places like the book of James, where James is disagreeing with Paul somewhat on works vs faith. In other places you'll find Paul telling the gentile Christian that they should not be circumcised nor follow the Law because they are not Jewish. This was not a popular opinion among many Jewish followers of Jesus. The divide really takes off though when Rome starts persecuting Jews but not yet Christians, and Jewish followers of Jesus get scooped up in that, while Gentile ones likely avoided association for protection from persecution. The loss of their ties to Judaism left a huge gap in the early formation of Christian theology.. access to the texts.

Which brings us back to this article. With a more complete lens to look at the early formation of scripture (and a more generous orthodoxy to leave room for what it can teach us) students of the history of both Judaism and of Christianity will have more opportunity for growing together, as we should have been all along.