So, while the people who created Marxism were atheists, the background of those who were Jewish would have informed their theories and actions in creating this grand global socialist utopian dream? That is what I was getting at— The notion that Jewish background and connection is relevant to the history of socialism, as opposed to extrapolating from that to a denigration of Jewish people and/or Israel for what the marxists wrought. The vast majority of Jewish people never had any connection to socialist theory or the US communist party, and certainly non-European Jews had no connection whatsoever.
I think you overstate the case when you say their background informed their theories and actions. In fact, since they were rebelling against their previous religion, none of the religious ideas or practices informed them and the only thing that remained was the fervor. ‘Fervor’ meaning passionate drive and investment in sweeping systems of thought or belief. Hence the term ‘true believer’ has a strong association with denizens of the left who pursue their political religion with all the fervor of devout theological adherents.