Thats true
Otherwise, they wouldnt even use the Old Testaments
But i disagree on the point Jews view xtianity as a deviant
branch, i am not even sure they view xtianity as a branch at
all
Jews differ on their views. I mean, that is from my experience
of speaking to a Jew myself and reading on Judaism.
Some jews view jesus as a false prophet, some view him as a
prophet but a bit wayward, some view him as non-existent even.
Then there are the "messianic jews" who are actually christians
in the religion sense.