Atheism in the dictionary is described as “ the theory or belief that God does not exist.”, many atheist in the web are misinformed however. The idea that atheism is the lack of believe in a god or gods and that it is the default position that every person starts from is completely wrong. if this was true then we should be able to see some cultures in the world that are completely atheistic, but there are non. China, Russia, and Cuba have tried to get rid of belief in God but that is not the same thing. Furthermore where was a study done in the UK that supports the idea that people are born believing in God
All of the atheist i know believe that their position doesn't need to be defended because they don't consider their world view a "belief".
Now lets take a look at this for a moment, If a person doesn't have evidence for something, and also doesn't have a belief (for or against) it, then the best you can say is that you are an agnostic. Atheism does not claim this at all, in the contrary
atheism is not lack of belief because there is a lack of evidence . It is the belief that lack of evidence (or perceived lack of evidence) is evidence of absence. in other words, an
atheist has faith that everything in the universe from physics to energy to life (DNA) can be explained away without God therefore they believe there is no God.
This is as close to any kind of evidence that an atheist can produce for their believe, and it doesn't even lead to a believe in no God.
Whenever i have seen an atheist try to answer the question "what evidence is there for the belief that there is no God?" it is always some rant against theism and not actually evidence for atheism. The reason for this is because there is no evidence! It is illogical because infers that information can come from nothing and order comes from disorder out of random change, things that are not scientifically accurate.
However if a theist is asked "what evidence there is for God? ", a Theist can say that the fact that the universe has physical laws and that there is order in the universe and that there is information in DNA, that is evidence that it was arranged by a mind - since there is nothing else we know of that can create information and order. Therefore the hypothesis that there is a God is logical .
there are other people that can better explain this issue than me. for more information please check out
William Lane Graig's site at www.reasonablefaith.org