Christianity has a terrible history of picking on the Jews for their faith. They looked at people and determined they belonged to the Jewish race. This led to a toxic combination of religious and racist hate.
Antisemitism even existed in Jesus. Jesus never said a word against the Romans brutally oppressing his Jewish people. He did in Matthew 23 say the Jewish leaders were dangerous and murderers and challenged them to kill him. This put them in danger of being attacked under the guise of defending the innocent. The leaders had ordinary Jews in their entourage and as community members. They could not be endangered without hurting Jewish women and children.
The antisemitism in Jesus lurks in his memory. The influences are turned on.
Christians use the "God forgives" statement as an excuse for not having empathy when somebody hurts innocent people who are not in their circle. It forgave Hitler's antisemitism. The Church welcomed him to communion and never once said, "You hate a whole group of people so should you come to communion with such hate in your heart?" It never conducted a systematic countering of his Mein Kampf. It was never formally condemned for heresy despite its religious material. The Church never put it on the Index of Forbidden Books.
The Christian ethos of mercy and over-confidence in redemption was the reason Hitler was dealt with lightly in 1923 - when he was found guilty of an attempted coup.
He was monstrous and yet Catholic Germany forgave. Protestant Germany forgave. Atheist Germany was too small to count. Germany decided to move on. Liberal Christianity was rife in Germany and it led Germany to forgive. Traditional Christianity was just as complicit.
A decade later their forgiveness had created this actively genocidal creature. Failure to hold him responsible in any meaningful way put him on the path to becoming it. It made him this dictator who engineered the worst evil of all time. Not only that but the anti-Jew seeds are still sprouting since Hitler watered them. Weedkiller does little
Indifference is dressed up by too many of us as it is as forgiveness. Christianity does it more than anything.