Marx wasn’t born a Jew or raised a Jew. (his parents converted out)
And he HATED JEWS AND JUDAISM.
On the other hand, there's never been any doubt that Marx was virulently anti-Jew, and while I can't say I know that Soros has the same level of hatred for Jews, he was born a Jew, but there's no doubt that he doesn't self-identify as Jewish (unless to claim victimhood,) and he certainly doesn't have any love for Israel, America, or any sort of national sovereignty.
Anyone who claims victim-hood for Soros is lying.