Jews were no more slaughtered by Christianity than Jesus was crucified by Judaism.
Those acts were done by either political or perverted religious interpretations justifying death.
I Thes 2:
14For ye, brethren, became followers of the churches of God which in Judaea are in Christ Jesus: for ye also have suffered like things of your own countrymen, even as they have of the Jews:
15Who both killed the Lord Jesus, and their own prophets, and have persecuted us; and they please not God, and are contrary to all men: