Einstein is a bad example. He wasted his last 30 years trying to disprove quantum mechanics cause "God does not play dice"
The full quote, according to Wikipedia, is: "I, at any rate, am convinced that He [God] does not throw dice."
Here's an excerpt from a
public lecture by Stephen Hawking:
Einstein was very unhappy about this apparent randomness in nature. His views were summed up in his famous phrase, 'God does not play dice'. He seemed to have felt that the uncertainty was only provisional: but that there was an underlying reality, in which particles would have well defined positions and speeds, and would evolve according to deterministic laws, in the spirit of Laplace. This reality might be known to God, but the quantum nature of light would prevent us seeing it, except through a glass darkly.
Furthermore, if Wikipedia can be believed, the Einstein vs Bohr debates on the subject were not quite as useless as you make them out to be, and helped form the groundwork for Quantum Mechanics. Indeed, if nobody had ever tried to refute the theory, I would be concerned about its accuracy.
Now this is all from about ten minutes from research, but what this suggests to me is that Einstein wasn't saying that QM isn't true because "God doesn't play dice", he was saying that "God doesn't play dice" because QM isn't true. Again according to Wikipedia, he did revise his views through the debates, so it would seem to me that he was actually reaching a conclusion based on evidence, rather than religious opinion (However wrong that conclusion may have been).
The US is a much more secular nation than the countries that do have Jihads. There's no reason to believe that it couldn't easily swing round to being a theocracy again if the conditions were right. The so called "Moral Majority" would love to see that happen.
If we are truly that close to the edge, then how do we know that we aren't the sheep? How do we know that we aren't the ones who are morally flawed?
But I don't believe that a true theocracy would reasonably occur in the near future in the United States. There are so many denominations in the US that it would not be as easy as you suggest; if Catholics took control, how would non-Catholics know that the Catholics wouldn't make laws against them? And vice-versa if non-Catholics took control. And I don't see Muslims, Jews, etc just accepting that state of things.
NB: According to the
2001 Statistical Abstract, 1/5 of the total population is non-Christian. (Note that the statistics are based on a representative random telephone survey of the Continental US.)