Marx was of Jewish descent himself, and argued for the liberation of Jewish people. He brutally took down one of the most anti-semetic pieces of his time, The Jewish Question, in his essay On The Jewish Question. Bauer argued for forcing Jewish people to deconvert in The Jewish Question.

In On the Jewish Question, Marx argues that Religion has played a terrible role in supporting the ruling class, whether that be the aristocracy in Feudalism or the Bourgeoisie in Capitalism, but ultimately argues that this is not an issue of ethnicity, but Mode of Production, and that antisemitism is abhorant.

You don’t have to be a Marxist, but trying to paint a Jewish man as antisemetic, that argued against some of the most antisemetic contemporaries of his time, is historical revisionism.