From the post:

I wondered why the book was banned. Was Courant Jewish? I’d never considered this before, because I couldn’t care less about the ethnicity of authors. Jew or Greek, bond or free, male or female, I just care about their content.

John, you start a post about Courant's Jewishness by denying that you have any interest in his Jewishness. This conveys the sense that being a Jew is dirty and should not be brought up in polite company. Don't do this.