No. Jews are not allowed to eat or drink blood (Leviticus ch.3).
No, Christians do not reject Jews. However, Jews reject Christians.
Christians mostly killed Muslims and Jews during the Crusades. The whole thing was wrong- it was a slaughter.
I believe you are thinking about the Jews putting lambs blood on their door signifying they were Jewish during one of the ten plagues sent from God when the Jews were enslaved in Egypt.
Jews like Paul persecuted the christians.
It was one of many blood-libels in medieval Europe and was an excuse to kill Jews.
Christians believe that the Messiah Has Come. Jews believe that He Has not.
Christians believe Jesus is the messiah, Jews don't.
Jews are not Christians. Christians believe that Jesus of Nazareth was the Messiah. Jews (and remember- Jesus was a Jew himself) believe that the Messiah has not yet come.
They had the power to persecute Jews and Christians if they had wanted to
Why did who kill which Jews .
True Christians do not hate Jews. Nominal Christians may hate them because they are a different religion.
It didn't seem to make any difference to Hitler what type of Jews were killed during the Holocaust,