I do understand the response from the Holocaust symposium - although as wolfinthewood mentions below, persons of Jewish heritage who were converts to Christianity were also Holocaust victims.

They were not killed because they were Christian, but because they were Jews, so that's really moot.

you'd think that someone would experience some cognitive dissonance there.

Well, historically, there was never any cognitive dissonance about Jesus being a Jew when pogroms were enacted against Jews who Christians viewed as Christ killers, so the anti-semitism is a traditional attitude just rearing it's head again.