> Christians on the other hand consider themselves a superset of Judaism. For the most part they don't dispute Judaism (as it existed before 0AD) and think of Christianity are an updated/evolved version.

Can you clarify? Because the Gospels are largely the accounts of a man who spent the most impactful years of His life disputing Judaism as it existed at the time.

Also Christianity cannot be an offshoot of the religion now called Judaism, because the former precedes the latter chronologically. Rabbinic Judaism is significantly newer than Christianity. The old Hebrew religion died with the Second Temple.