Dear nick,
As other European societies have determined in the millenia before I was born, ‘if the mom is jewish, so was the child’. That did not delineate between ‘practicing/nonpracticing’, just bloodlines. So, Marx was a Jew, and he ‘voted’ left, by his writing ‘Das kapital’, aka, the Communist manifesto.
I am fully aware, but that doesn’t apply here. Marx never considered himself Jewish, nor was educated Jewish, so I think blaming Jews for him is gauche.
*You are wrong about one thing. It wasn’t European societies who determined that, it is Jewish law.