[j9461701]

> You could tell them that disease is caused by tiny animals, and that the earth is a sphere that orbits the sun, but getting them to believe you is a another thing.

I can find a cholera outbreak, and tell whoever will listen to stop drinking water from the local wells and eating from the local markets. Go to another part of the city for water and food. Those who listen, even if only one, will be my proof. I can also do a cool science experiment with seaweed agar, silver and bacterial growth but that's not as dramatic.

The earth being a sphere that orbits the sun can't be proved without a telescope, but I can propose a vastly simpler and just as accurate approach using kepler's laws. If I was paying attention in high school physics, I can even do cool stuff with Newton's laws of gravitation to show that "As above, so below" (the planets obey the same law of gravity that we earthlings do).

Yes people might still not believe you, as we can be a stubborn and prideful species, but you know the 'why' of many things and so can keep making correct predictions based on that.

> You won't introduce quarantine just because of germ theory: book of Leviticus already has a version of quarantine, "the law of the plague" well before germ theory.

The bible simply lists procedures, it doesn't explain why you do these things or allow you to extrapolate to other situations and scenarios. By contrast, simply by knowing the "why" of infectious diseases, a smart person or government could isolate the cause of - for example - the black death fairly rapidly (rats w/ fleas) and begin taking steps to solve the issue.

A modern person has a head full of correct answers for questions people 2,3,4000 years ago have yet to even ask. That's powerful stuff, and once they've proved their credentials in some way the books they write will advance humanity by millenia.

[SideburnsOfDoom]

> I can find a cholera outbreak, and tell whoever will listen to stop drinking water from the local wells ... Those who listen, even if only one, will be my proof.

Results with diseases have a fair amount of chance, as we should all know by now. It might go as you say, it might not. Your disciple might leave and get cholera soon after due to exposure beforehand. A person who stayed and didn't get cholera might attribute their success to the manner in which they prayed. Or your guy's success to the manner in which they prayed.

It's hard to falsify the assertion that "they were not stricken because they were righteous / said the correct prayer", and "statistical significance" is not a dramatic or obvious thing to convey.