Hmm, one thing I haven't seen anyone bring up yet (although I have been skimming):
Over the years, won't humanity create a new religion? It happened in Fallout with 'Atom', although that is just fiction, and from an atheist point of view, all the religions of the world had to be thought up at some point, right?
To avoid arguments, I'll exclude modern-day religions from this.
Look at the Ancient Egyptians, the Incas, the Aztecs, the Ancient Greeks, Ancient Rome, etc. Hell, I'm Pagan, but look at that, too. Someone somewhere in time would have thought this stuff up, whether they had a dream about it and thought it was true, or were schizophrenic and thought a god was speaking to them.
Humanity has always felt the need for a higher power, and in the middle of chaos, even more so. Perhaps the modern gods would be cast aside for failing to prevent nuclear destruction, and the offspring of the survivors (inbred or otherwise) may look to new deities. Maybe science will be twisted in a way and become a religion. The religion of science, like Fallout's Atom?
The rabbi, whilst a nice touch, may evetually find himself swamped by new religion. We don't need him to preserve religion, because religion never dies.