I can try to address this.
Jews want Jews to continue. Some are more aggressive than others. The idea that everything we’ve been doing for the last few thousand years becoming extinct is awful.
There is a huge wave of young 20 to 30 something organizations of Jews that do things that are “culturally” Jewish and explore theology and basically try to give the Wandering Young Jew a home. It can be part of the local kollel, a secular Jewish gay/rights org, Hillel, whatever. Jdate.com is an example of sheer genius + benefit to the Jewish people.
Thing is, the Jewish community used to be petty tightly packed around each other, but now everyone is so mobile. New community structures are emerging to address that. We’re also in a post-guilt-Holocaust phase and into a Jewish/Israel identity crisis phase.
The Reform movement was pretty strong when it started and it was a strong intellectual force in Zionism. Unfortunately, the Reform have kind of slipped away from Jewish observance in many places and kids don’t feel “attached” to what others think is sacred (even if they are atheist). The Conservative movement was a response to the reform and was the forward-thinking intellectual and religious form of Judaism. Jews have a lot of choices - maybe that’s our problem. Maybe it’ll save us.
Now that we have the freedom to move about the country, we’re less likely to be nervous about assimilation.
But…Judaism has withstood a petty major litmus test. I don’t think we’ll cease to exist. And if every single Jew in the United States converted to Christianity and then 6 million Torah-observing Jews in Africa arose, then what do I care? Gosh, I just hope my son doesn’t give this up.
100 Jews in Africa? Well, that would be sad. I think Judaism is beautiful. But then I also think of the things that Judaism has left: foundations for Western law, philosophies, physics, universities, literature, history, countless famous people, the Polio vaccine, our commitment to fight bigotry (ie ADL’s amazing programs in schools), whatever. We made our mark and we have affected every single person on this earth in a good way. It doesn’t negate mistakes, but if Jews ever cease to exist, I’m sure they’ll be as esteemed. And if not, the things that we believe in will continue on.
Also, belief in the supernatural is still pretty common in Jewish circles. I’d say majority. But since it’s not stressed, we don’t think about it. Instead, what’s emphasized is the social phenomena of nationhood and the psychological attachment to it.
Obervant/cultural/whatever Jews think that Judaism is a religion that will survive with or without God, because Judaism is about each other. And repairing the world.