If anything Christianity affected Judaism, because the Jewish religion was around along time before the Christian religion, therefore Christianity affected Judaism negatively because more people converted to Christianity!
Answer 2
While Answer 1 may be correct in terms of the general direction of conversions, both forced and by choice, in terms of philosophy, literature, and general ideology, Christianity is fundamentally an outgrowth of Judaism. Before Christology developed as a Christian Discipline, the Jewish ideas of the Messiah, Redemption, and the End of Days helped to develop similar doctrines in Christianity. Christianity also carried forward the Jewish concept on Monotheism. Judaism also provided a backdrop for early Christians of the "unredeemed" and "pitiable" allowing them to claim a natural ascendancy and "betterness". This sense of superiority allowed Christian conquerors to knowingly subjugate America without regard for the indigenous cultures that they would displace and/or eradicate. Finally, the Bible used in Christianity is over 75% the same as that used in Judaism.
