Actually, anti-semitism has become the modern synonym of the word "Blasphemy". Blasphemy in it's meaning, is an action which is so utterly against God that is should in no way try to do the said action or even argue for it. "Anti-Semitism" has become the near comparison for the word. Calling something/someone Anti-Semitic invokes the very same social sanctions of the Blasphemic words. If someone says anything against Israel or Jews, they go: "Oh! Anti-Semitism! Look!"
Just replace Anti-Semitism with Blasphemy, and you have exactly the same purpose for the word.
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