Bruce Thornton responds:
The story of Christian anti-Semitism has been told and retold ad nauseam. The mainline churches, including the Vatican, have apologized and agonized over it for decades now. But what is its relevance regarding Muslim anti-Semitism? The tu quoque argument--"You did it too"--is fallacious and useless.

More to the point are the differences between Muslim and Christian anti-Semitism. The scriptural authority for the latter is exceedingly thin: it pretty much is based on a reading of Matthew 27:25: "His blood be on us, and on our children," which was twisted to refer to all Jews instead of just those in the mob that demanded Jesus's crucifixion. Compare this to the numerous Koranic verses and hadiths, documented in Dr. Bostom's book, demonizing Jews and justifying violence against them.

Among Christians, a justification of Jew-hatred whose origins lay elsewhere was indeed constructed from the Matthew verse, to the shame of many Christians, but in time it has been recognized and rejected as a distortion of Christian doctrine. Where among the leading lights of contemporary Muslim theology do we see such a repudiation and rejection today? Rather, traditional Islamic anti-Semitism continues to be preached in mosques and endorsed across the Muslim world, now given a carapace of Nazi anti-Semitic tropes and rhetoric.

Let's remember, too, that Nazi anti-Semitism owed little to medieval paranoia about Jews as Christ-killers and well-poisoners, however much such traditional anti-Semitism made it easer for the Nazi variety to gain traction among Germans. Nazi hatred of Jews was based on crackpot, pseudo-scientific racialist theories and anxieties about the centrifugal forces of modernity and its cargo of individualism, capitalism, industrialization, and urbanization, forces that came to be embodied in Jews. That's why when you look for European anti-Semitism outside of Muslim communities, one is as likely to find it on the anti-American, anti-globalization Left as on the extreme Right.