While I agree the Holocaust would not happen as we know it, we still will see anti-semitism of which we haven't seen in OTL in Europe since 1945. And without the horror of the Holocaust we are talking about these anti-semitic exiles and seizures of property that European nations had done for a thousand years continue, along with the fact there wouldn't be an Israel for us (I'm a Jew) to run to in times of horror or persecution, or to look out for Jewish rights around the world (Israel diplomatically often gets involved in local problems around the world, such as the Swiss hotel that put up a sign saying Jews couldn't use the pool which happened this year). So, while yes a TL where millions of my family doesn't die is great to think about, we do have to think realistically about how it's not going to be a rosy sunshine filled TL for Jewish history either, from 1945 on this ATL Jews are going to be treated worse in Europe than OTL Jews have been. And this will also mean the same for American Jews, who are probably going to be a smaller numerical group than in OTL due to greater assimilation (without the Holocaust as a defining moment German Jews in America are going to assimilate quickly and be more secular compared to Russian Jews in America as they did prior to the 1930s, plus more discrimination and less sympathy).
In OTL Stalin and the Soviet Union was supportive and strong to recognize Israel at the beginning and Stalin reversed many of his anti-semitic policies for awhile thinking Israel, with many socialist Jews, would be natural allies (of course this didn't pan out like Stalin thought, and being "rejected" by Israel led him to more anti-semitic policies). But in this ATL we can see him having occasional pograms (especially in Ukraine) alternating with "come to me, I'll protect you from the evil of Western and Central Europe" and we could see a Jewish Autonomous Oblast (either OTL one along the Chinese border, or a different location) be more "successful" in the terms of having a larger Jewish population and sustainable culture. Depending on the evolution of the Middle East we could see Stalin (or more likely his successor) be pro-Zionist in order to put a thorn in the British mandate in Palestine and cause them distractions, as no WWII means the Great Game is extended a bit in time.