No; but everyone always attributes their survival to some supernatural intervenntion when the saved and the damned are both praying to the same God...We are in danger, and we may already be doomed... The bulk of chemicals in our diets, pollution, stresses from war and exploitation, and disease may lead to a species wide collaps...We cannot evolve nearly as fast as the germs we feed for higher profits... But no matter how bad the catastrophe, it is likely some will survive, and make the same mistakes over again..

Do not count on it. Most species have already gone extinct.
20 or so species of hominids have already gone extinct.
We are part of nature, not the purpose of nature, and we may be the source of our own extinction if we are not more careful with technology, science and our planet.
Life on earth will survive, it has survived many mass extinctions, but I would not be so sure about humans surviving. The notion of our assured survival is a relic of the anthropomorphic and anthropocentric thinking of religion (man as the crown and purpose of creation).

AIDs? Of all possible diseases, you pick AIDs? (which, by the way, is not an epidemic). Either way, in the case where you were arguing something more immediately dangerous, such as Bubonic Plague or Anthrax this is because of genetic diversity among human beings given to us via natural selection through evolution. Basically, because if it could, we would have been dead long before we would've been humans. Even after that, we have the most developed medicinal system of all species, and can thus devise cures to said diseases.
Why shouldn't it? Why does gravity exist, why don't I just float off the world? It's inherent to it's nature by the laws of the universe. Unless of course your asking the direct scientific reasons why, to which I suggest you research on your own. It's mostly logical, as the explosion can only send ionizing particles so far, and they are subject to the inertia of the world around them. Why would we? I have no desire to be destroyed, nor do most people in power to cause such a war. Said war did almost happen, I suggest you research the Cold War, but in the end the fear of Nuclear Holocaust proved to overrun the superpower's struggle for dominance. This is known as Nuclear Deterrence. Basically, because we have an evolutionary inherent wish for our species and ourselves to survive, and causing such a war would be counter-productive.

Again, you're questioning fundamental forces of nature. In the earthquakes example, the friction between tectonic plates that releases the energy to create and earthquake only happens where the tectonic plates are actually grinding against each other, and the energy is only so much as to cause the effect we know as an earthquake in a specific area.
Again with the forces of nature. We're not stupid enough to give ourselves cancer (at least not immediately stupid enough), and why should they have? Man made chemicals are not inherently different to any other chemicals.
I agree that global warming will not kill humanity, but I do believe that humanity will inevitably end. Whether it be in the big crunch, or the idea that all atoms will inevitably decay to hydrogen, or if the universe reaches equilibrium of heat as thermodynamics state it inevitably will if it's a closed system, humanity will end one day. Scientific reasoning is not even needed, basic logic would suffice.
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We havent died out (as a species at least) because of a number of factors:
-too many of us (horrible events can only have SO much of an impact on humanity)
-our minds are powerful things, especially in groups. (human kind has a tendency to work together in times of distress)
-we are VERY VERY VERY flexible and adaptive.
-as for the nuclear bombs not polluting the entire planet, that just comes down to the laws of physics. Nothing can expand to that extent without a very large amount of energy.
-as for AIDS and other diseases not wiping us out, as a sentient being, I personally dont think that humanity will just sit around and wait to die out from a disease that is most likely spread from other humans. We have containment, medicine, etc.

You are right. The only problem we have as a species is lack of sight into the future. Look at climate change. We could very well prevent catastrophes, but we prefer to look away and wait. Then we can be very good at facing those situations, but there will be people without the resources to do so (probably the ones who should be less blamed).
We will survive, but what will we have to sacrifice for that? Our humanity? Or have we already lost it along the way?