Jesus was crucified and early Christians were killed and persecuted by Jews.
Christians have killed and persecuted Jews over the years.
The persecutors and killers were not doing the will of God, whether Jewish or Christian, but that sort of belief and behaviour still exists.
It goes back to the origin of blood sacrifice in the Abrahamic religions. In Genesis 15, Abram wasn't told to kill the sacrificial animals (it was about the covenant of the land) and in the book of Jasher the near-sacrifice of Isaac was due to sibling rivalry between Isaac and Ishmael.
The misunderstanding of sacrifice is part of the lessons of the gospels:
But go ye and learn what [that] meaneth, I will have mercy, and not sacrifice: for I am not come to call the righteous, but sinners to repentance.
Matthew 9:13
For I desired mercy, and not sacrifice; and the knowledge of Elohim more than burnt offerings.
Hosea 6:6
This leads to the knowledge of the righteous servant:
He shall see of the travail of his soul, [and] shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities.
Isaiah 53:11
Also Psalm 35:
Let them shout for joy, and be glad, that favour my righteous cause: yea, let them say continually, Let YHWH be magnified, which hath pleasure in the prosperity of his servant.
Psalms 35:27
For without cause have they hid for me their net [in] a pit, [which] without cause they have digged for my soul.
Psalms 35:7
Which connects back to the gospels:
But [this cometh to pass], that the word might be fulfilled that is written in their law, They hated me without a cause.
But when the Comforter is come, whom I will send unto you from the Father, [even] the Spirit of truth, which proceedeth from the Father, he shall testify of me:
John 15:25-26