If by "most atheists", you are referring to the entire world, the population of atheists in China dwarfs the rest of the world's atheist population. Most Chinese Atheists adhere to a combination of Confucian and Materialistic philosophical principles.
If by "most atheists", you are referring to Western Atheists, such as those in Europe and Anglo-America, these Atheists adhere to Rationalist Skepticism or Humanism as philosophical principles.
Most atheists adhere to humanism
Most atheists I know are not into philosophy, except empiricism.
Atheists have families and for the most part teach their children to be of high moral character. Existentialism is a term most often found in philosophy, so to me that is moot.
For the most part, your distribution's package manager will have it available, assuming that it doesn't adhere to the "free [libre] software only" philosophy.
There are Atheists, but the phrasing of the question is odd, because, as others have pointed out, Atheism is not a codified religion with edicts, meeting places, and theology. So, there is nothing for them to adhere to and no place for them to adhere to it.
Atheists are people who do not believe in religion.The atheists were the most calm and rational people involved in the debate.Studies find that atheists are generally happier and more successful than those who follow Christianity.
OpinionChristians are in the business of converting the world to their way of thinking. They are under the mistaken notion that all good moral behavior comes from religious laws and beliefs and that theirs are the best. Atheists are anathema in this process since they choose to not adhere to any religious beliefs. It should be noted that not all Christians harass atheists but many sects preach against atheism from their pulpits and often paint a picture of atheists that doesn't mirror reality.
There is no "official" atheist symbol as there is no governing body of atheists. The US Military has developed a symbol (stylized atom) to mark military graves of atheists and some atheists use a red "A" on their web sites and blogs.
Not all. Many are polytheists, some are even atheists. What philosophy to follow and whom to worship is a personal decision in hinduism.
Ayn Rand insisted that it was. She viewed Christian charity as weakness and foolishness.Answer:There is no canon of needed atheist beliefs. Aside from the fact that, by definition, atheists do not accept the existence of deities there is no further list of how they must behave, relate to others, society, nature or anything. Some atheists may hold opinions in direct opposition to other atheists. This does not stop them from being atheists or even be classed as a subset of atheist.
Atheism and Marxism are not inherently linked, as atheism is simply the lack of belief in deities while Marxism is a socioeconomic theory. Atheists may hold a wide range of political beliefs, whether socialist, capitalist, or otherwise. It is important to distinguish between atheism as a personal belief and political ideologies like Marxism.
Most people expect atheists to be like goth or emo people, in my personal opinion they're no different from any other religion, if not happier.
No. Atheists are simply people who do not think there is sufficient evidence for the existence of a God or gods. While some atheists do bother Christians and can be a nuisance at times, most stay quite and carry on with ordinary lives. Unfortunately, as with all groups, the most vocal atheists are the most noticeable ones. So it is important to avoid making a judgement based on this small portion of a large group.