1 is still applied today, and is certainly not a closed case (i.e. the reverse statement "there is nothing structurally better about monotheism" isn't really resolved either.
What I meant by this is the naive idea many people (including on this forum) have that the Roman Empire turned towards Christianity because monotheism was structurally better than polytheism - that there was something about the idea of one god that, once introduced, overpowers alternative beliefs by default. That doesn't even apply to the Roman Empire itself (the
civil religion was headed toward collapse by the Crisis of the Third Century, but monotheistic Christianity was only one religion that fit the bill for a replacement), and breaks down to total nonsense when you consider anything outside of Europe. India has been solidly polytheistic for its entire history, China makes you question whether "gods" is even a coherent religious concept, etc. Buddhism in particular is a great example - when Buddhism came into contact with local religious traditions it incorporated them and became
more "polytheistic".
In any case, the burden of proof is on those who say that there's something structurally better about monotheism, rather than those who don't.
2 is just racism which is still about.
You're misinterpreting me here - reasonably, since I was tired when I wrote my comment and didn't give much explanation. "Jewish stubborness theory" is a pseudo-historical idea that the reason Judaism has stuck around, unlike all other indigenous Near Eastern religions, is because the Hebrew people had a peculiarly uncompromising attitude and a "special" religion in some way. The more we know about extra-biblical Jewish tradition, the more we see that this is just
post hoc reasoning.
Prior to the Babylonian Exile "Judaism" was basically henotheistic, with Yahweh just the sole patron god of the Hebrew people. Monotheism only started to coalesce during the Exile - and that was such a massive social trauma that it would be surprising if they
hadn't differentiated their patron god in some way. And even once monotheism was established, there is plenty to show that Jews weren't any less willing to adjust their beliefs as much as any other people of the Eastern Mediterranean, at least up until the Maccabees. And
even after that there was significant religious accommodation with the Romans, etc etc.
If anything, IMO, the thing that really differentiates the Jewish people from others in the ANE was Christianity's obsession with them (for obvious reasons) - nothing "inevitable" at all. But people see the history of Judaism today and think "well, there must have been something innately special about their religion beforehand". I disagree, I think that's a big historical misconception.