What did the origins of judaism and christianity have in common

1) The fact that Christians take some of their books from the Tanach 2) They both have derived from semitic languages 3) They were both started in essentially the same region 4) They are both Abrahamic faiths 5) Both of the major locations for these religions today is similar 6) While Christians believe in "Trinitarian monotheism", it is still a form of monotheism (Judaism rejects this idea).