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Reason10 Actually, (if you are referring to Karl Marx) his family was considered non religious Jewish, but they converted to Christianity.
https://en.wikipedia.org/wiki/Karl_Marx
Here's another perspective =
Karl Marx and Materialistic Messianism
Published online by Cambridge University Press: 10 January 2023"Karl Marx has long been held up as the archetypal self-hating Jew. On the one hand, Marx's family was (before his father's conversion) very Jewish. Both his father and mother's sides included many rabbis going back generations. On the other hand, Marx was baptized at the age of six, received no Jewish education and is infamous for quotations such as “What is the worldly religion of the Jew? Huckstering. What is his worldly God? Money.” Marx's contempt for Jews could not be clearer. Yet, despite this, we argue here that Karl Marx ought to be considered a Jewish thinker."
https://www.cambridge.org/core/books/abs/reclaiming-the-wicked-son/karl-marx-and-materialistic-messianism/8BCF27FBFDF4DEC5838DB1EDC83B976A
He's still the SOB that caused over a century of the world's problems.