If Luke had access to the final version of Matthew (as opposed to both drawing independently on other sources), why are there so many significant differences between Luke and Matthew on issues such as Jesus' genealogy, circumstances of birth, and events following resurrection?
Many scholars (and particularly most Jewish scholars) hold that the concept of virgin birth in Christianity originated with mistranslation of Isaiah 7:14 into Greek, and therefore that authors of Matthew and Luke were Gentiles [REF].