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Atheism is the lack of belief in a deity.
Theists often assume atheism to be a "belief". And therefore they claim that atheism is a belief system that also requires "faith" (to believe there is no god). This is an erroneous characterization. A "lack of belief" is not a "world view"; it presupposes no rules, doctrine or dogma. It's merely a lack of belief in a god. Do you believe in the non-existence of Santa Claus? Would you call yourself an anti-tooth-fairyian? Is ones' identity or world-view tied to what they don't believe in?
Here is the origin of the word atheist/atheism:
"Atheism", from the Greek:
Therefore, "atheism" is "the state, quality, or condition of being without a god or deity". "Atheos" would literally mean "godless", and "atheismos" ("atheism") would literally mean "godlessness".
Notice that the prefix "a-" does not mean "not" or "against". It's a common mistake to think so. That would require the use of the Greek prefix "anti-", such as in the term antikhristos ("antichrist").
Now, let's change that suffix. "Atheist", from the Greek:
An "atheist", then, would be "a person who supports or subscribes to a godless state, quality, or condition".
This does not necessarily mean that atheists positively believe that there is no god. It simply means that they advocate a lifestyle that is devoid of one. They live their lives as if there were no god.
Atheism can be further broken down into the following sub-categories:
99% of most atheists are the "weak" variety, even though most theists' idea of atheism is something different:
A typical atheist may be strong towards a specific deity such as Jesus, claiming that they are confident the Christian god does not exist. Likewise a Christian may be a strong atheist towards the Hindu gods.
Furthermore, agnosticism can be considered a subset of atheism. Mainstream media and many people will rarely make note of this because many choose to use the term agnostic to describe their lack of belief due to the negative connotations the media associates with the term atheist, but technically agnostics are atheists: You don't typically believe in something you are not sure exists! For the sake of argument, some people will note it is possible to believe in something who's existence can or will never be known, but such a position could be clinically diagnosed as a symptom of mental retardation when the scenario doesn't involve something as politically-correct as mainstream religion.
Agnosticism can also be broken down into: