Yes, you are right.
Your point is valid.
You say, “How is it that you Christians preach at us, nagging us not to hate and despise the Jews? Did not Christendom hate and despise the Jews?" And although many of the ‘Aryans,’ the Nazis, also hated the church-going people and Jesus himself, you say quite wisely, "Were not the Nazis the children of the church-going? Did not their ideas not spring from Christendom?"
You ask "How is it that you inveigh against our antagonism towards Israel and indeed towards the Jews?"
And you say further, "Did not the Jews want to kill Jesus? One of our prophets whom we love... and your god?"
And "Are not the Jews unbelievers, kaffir and thus essentially out of harmony with the divine?"
Finally (and here the point of your sword touches the heart)-- "Did you not do far worse than our Al-Nusra or Al Qaeda or ISIS ever do by killing six million of them in these camps of the Europeans? Who are you to lecture us?”
My cousin, this is indeed what we did-- and this is indeed, who we are, but let me also say this, our error, our sin, is also your sin. We worship the same God and we both of us misunderstand and reject the same God.
We were in error in our understanding of faith and you are in error now and this error leads to the hatred of our elder brothers (and sisters too), the Jewish people. You are under the same delusion as we were and to some extent still are. What is this delusion? We think that faith is primarily something that mankind does. Man has faith, or not. And those who do not have faith, or the right kind of faith, must be redeemed or if not, go to Hell. Torture must be used against those who do not believe. This torture does two good things. It shows the difference between faith and non-faith to the people of one’s community and it encourages the non-believers to become true believers or at least submit to the divine harmony. Is this not how Al-Nusra thinks? Is this not the doctrine and policy of HTS and many other militias? Well, this doctrine and policy is quite familiar to us in the West, after all, it was our own. Have you heard of the Inquisition? No? Well let me tell you, we know from torture. Maybe more than Al-Nusra or ISIS will ever know. Moreover, let it be said, that we “knew” as Al-Nusra “knows” that the unbeliever defiles. He defiles his community, he defiles the land. He is a disease-vector and a risk. This idea was also part of our doctrine and policy. But then something happened. This doctrine and policy grew to be something more than a doctrine and policy. It became an hypnotic trance; Germans and many other nations believed that the best way to save the entire earth was to eliminate the disease-vector from the face of the earth. The name of this disease vector was “Jew.” And we did what we did best: we exterminated. This is something, thank God, that the Middle East does not share, the urge to exterminate. In the West however this is our ancient manner of problem solving. My cousin, here is what I have to say: we were wrong and our wrong was layers and layers and layers deep. God is like a janitor in a church basement where the sewage has overflowed and hardened. He cleans there with his mop and his scraper. And God, as you know, is not discouraged. He is an amazing janitor indeed. We in the West have layers of the foulest gunk to work through and it is not worked through yet. He works through faith and love. And faith and love? Those are his cleaners, these are his tools and this is who he is. Listen, my cousin, we in the West were completely wrong about faith. We thought that faith was primarily an attribute of man. We were wrong. God is a God of faith (Deuteronomy 32:4) . He is the one who has faith, emunah in Hebrew. And he “enfaiths” people, people like the prophet Samuel, Shammil in the Koran. Samuel was "established" or "enfaithed" to be a prophet. (I Samuel 3:19) He was girded about so that he could become a prophet. And yes, we do have belief but it is a result of God's faith, his enfaithment, his girding of the prophet whom you love, Jesus. The one we know to be God.
Cousin, you bear the Jewish people a grudge for wanting to crucify Jesus. But though we, both Jews and people of the other nations (Gentiles) meant it for evil, God meant it for good. He sent Jesus. He made Jesus to be a sin offering for many, for Jewish people and for people of the many nations. God so loved the world. He saw a terrible problem and he fixed it through Jesus. He made right what was wrong through this faith, this enfaithment. He justifies through this faith, this enfaithment. Therefore, lay down your burden, lay down your grudge against the Jews and against all unbelievers and even against own selves. What does your grudge have to do with God? Nothing. It's is not of him and it's not from him. Let me repeat, God so loved the world, enough to send his only begotten son. There is one thing you can know about every human being on this earth, from the littlest to the greatest. They are loved by God, so much so that he would give his all and more than his all. Do you see that? So, now, I ask you, what is it that God might have in store for us to do? Knowing this about God, what is the adventure that he sets you on today?-- waiting for you with loving arms with each step that you take, the one who prepares the way, the one who lifts you up as on eagle's wings.