Catholics had little to do with the holocaust.
Actually Catholics had lots to do with the Haulocaust. Its often not talked about because it makes Christians feel uncomfortable. Jewish hatred didn't engender from Hitler, it came from prominent catholic priests and protestant leaders like Martin Luther and Thomas Aquinas as well as many Popes. Christians in Austria, Italy and Germany had already believed that the Jews were inferior, which stemmed from the Christian texts, which imply that the Jews killed Jesus.
The Romans didn't want to crucify Jesus. As a matter of fact they thought he was fairly innocent. The Jewish people in the crowd wanted Barabas <sp?> freed and Jesus crucified. So technically they are correct in saying the Jews killed Jesus.
The Jews in courtyard. 2/3 of the Jews in the world live outside of what today is Israel.
I think the argument against this is bin Laden is a "Muslim," the mosque is Muslim, therefor it is insulting to the victims to put a mosque near a 9-11 site. You could make a parallel argument that Hitler was a "Christian," a church is Christian, therefor it is insulting the victims to put a church near a Holocaust site.
I don't agree with either argument.