What are the teachings of Atheism?
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As stated previously there is no organized belief system. Atheists are largely independent (free thinkers) and there is not strong organization although there are a few groups.
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Atheism is not an organized belief system - indeed it rejects faith as as useful way of understanding; it has no teachings.
To assume that atheists have common beliefs is to misunderstand what atheism is. Atheists simply don't hold a belief in god(s). That is all. Atheists reject faith-based belief and instead tend to rely on empirical (testable, repeatable) evidence.
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The above is correct. Atheism has no teachings: it is simply the position which reasonable people take when confronted by religion. Atheists assume nothing. There are good atheists and bad atheists. But the only thing which could be said to be a "teaching" would be this: "don't believe what anyone tells you without checking the facts and thinking about it for yourself." That's it. if you do that, and you do it thoroughly, then you'll be an atheist.
Whatever else you are is up to you.
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As noted before, atheism is not an organized belief system and has no teachings; however, in general, atheists would agree with the principles of secular humanism.
Note: atheist does not = secular humanist
What are the basic teachings of atheism and what are the logics of them?
There aren't really any "teachings" in atheism. One simply chooses to not believe in any deity. The logics of them are quite simple. Just USE logic. Through logic, with an open mind to logic, and a full understanding of logic, it is possible to realize that there really is nothing out there for humans to have hope for. No salvation. Many atheists find comedy in the tragic fallacies and hypocritical, senseless arguments found in organized…
Who leads atheism?
Atheism is the rejection of all currently made god claims. Just like Theism, it is an umbrella category for an incredible variety of different ideologies and moral systems. Just like there is no one leader for Theism -- there are actually leaders of different branches of Theism and there are branches of Theism that are more Congregationalist or Individualist -- the same is true of Atheism. There are numerous categories of Atheists who add belief…