Atheists are Atheists for a number of reasons. It could be because they use reason and logic to define their life, not superstitions and supernatural
events that were recorded by people who lived thousands of years ago in a scientifically devoid civilization.
It could also be the fact that they realize the notion of a "correct" religion is ridiculous because of the simple fact that every religion
throughout history thinks it is the only correct one, and for ultimate salvation you must listen to them, and that if you listen to another religion
you will be banished to some form of eternal hell or non-existence. If god is a truly gregarious being, he would ensure that there is one obvious
option and you can take it or leave it. Putting thousands of religions, and hundreds if not thousands of SECTS of a SINGLE religion on earth to
choose from is just cruel and unusual for a supreme being. (
cough)
It could also be that they have looked at the theory of evolution (don't start the whole "it's just a theory" argument - lots of things are
theories and are highly predictable), the fossil record, and have concluded that it makes the most sense. There is clear evidence, and more gets
added every day, to the case for evolution. If people do their own research it is very clear that evolution is real. There is no such thing as macro
or micro evolution, it's just evolution. Very small steps over millions and billions of years. Yes, evolution can account for things such as eyes,
and Intelligent Design is a farce.
With that said, I think you'll find most Atheists are actually Agnostics, because they do allow for the extreme possibility that there is a god out
there. I, personally, am an Agnostic. I have atheistic beliefs in evolution and whatnot, but I think there is obviously something more to this
existence that meets the eye. I'm not talking about ghosts, aliens, or generally hokey/spooky things.
If there is a god, he does not take any action other than the creation of the universe. We already have many theories on how the gaseous state of the
universe post-creation/big bang coalesced into stars and planets, and once you get a planet, the rest is history (if it's in the right location in
relation to a star[s]).
As a side note, I would like to say that I don't care if someone is religious. It's great that you think religion works for you, go with it.
However, don't try and push it on me, or if had children, them either. A particular religion does not belong in school to be taught as the correct
method of how we came to be because it is not scientific and has no accepted scholarly evidence to prove it, and should remain a personal opinion that
someone comes to through their own means.
As far as supernatural happenings go... If I were to find a planet with a civilization that has just come out of the stoneage, and show them, say, a
radio, would it not seem supernatural? They have no way to explain it, but there are voices coming out of this box, and you obviously can't fit a
person in there. Technology to someone who is not as advance will seem like magic. This is a simple example of how things can seem supernatural, but
obviously aren't.
Almost everything has scientific explanation related to it. It may take some time to figure things out, but it's attainable, with time. We still
can't get Quantum Theory and Relativity to mesh well (the science of the very small and the science of the very large). Hopefully, String Theory
will be the theory that does this. If string theory proves correct, this opens up even more questions than answers, but at least we'll be one step
closer to understanding the truth.
I think I've rambled on enough, I probably took more tangents than necessary, but that's just a bad habit of mine.