In the Torah itself, we find the following pro-Israel and anti-Christian trends in Rashi's commentary that appear to be a response to Christianity:
The Eternal Selection of Jewish Nation
The Jewish Nation as a Moral People
The demonization of Esav as a symbol of Christianity
The defense of Yaakov and his entitlement to the birthrite and the blessings
These interpretations of Rashi cannot be seen only as encouraging the Jewish community at a time of persecution; it appears that Rashi’s aim is to teach his generation how to answer theological challenges.