Academic categorization works in a bit different way than the theological one.
Christianity does not identify itself to be Judaism or a part of Judaism. That is why you will not find this in any historical Christian work. If anything, Christianity identified itself as being in the opposition to Judaism.
However, for modern academic purposes, they may see it as related because it has begun in the cultural background of "Judaism".. But such categorization is not relevant for us. As Paul says, Judaism was his former way of life, but his new life was in Christ.
I just finished reading this. A nice instructive example of what I’m talking about:
In What Ways Did Jesus Live As A Jew? - Chosen People Ministries
We can assess the Jewishness of Jesus by His relationship to the people of His day, by His relationship to the Jewish religion, and by His relationship with