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There are two kinds of atheism: strong (positive) atheism and weak (negative) atheism. The difference between these two is basically that a weak atheist doesn't believe in God, while a strong atheist believes in no God.

Weak atheism is essentially the same as agnosticism]. It states that since we have no proof of a God, we cannot know for sure that one exists. Strong atheism states that since we live in a scientific world where the existence of things is determined solely by their observability, we cannot assume anything unobservable to exist. God isn’t observable, therefore he doesn’t exist (cf. Occam’s Razor). This doesn't mean that an atheist wouldn't WANT to believe in God, it merely means that he has no REASON to believe in it/him.

Strong atheists often question the special treatment weak atheists – and theists – give to religion. If they believe that the tooth fairy or Santa Claus do not exist, why are they willing to give God a benefit of the doubt?

Strong atheism is often equated with religion since it takes a strong stance on the issue. This is, however, fallacious. Religion is not based on rationality, and strong atheists value rationality over fantasy. Therefore atheism is not parallel with religion.
I do not follow atheism. I merely concur with it.
by Servant Of Progress October 21, 2004
N. A non-theistic worldview embraced by people who are still bitter about the Santa Clause Revelation. Often leads to aggressively smug internet trolling on Christian webpage comboxes and social networking sites.
While verbally lacerating Christians for the Inquisition and the Crusades, atheists conveniently ignored the fact that in a few decades of the 20th century, atheist regimes killed over 100 million people. Mao Ze-Dong, Josef Stalin, Pol Pot, Kim Il Sung, among others, murdered countless millions in their pursuit of atheist totalitarian utopias. That is inconvenient for atheism.
by MountAthosfriend March 25, 2014
The belief that there was nothing, and nothing happened to nothing and then nothing magically exploded for no reason, creating everything, and then a bunch of everything magically rearranged itself for no reason whatsoever into self-replicating bits which then turned into dinosaurs.
Unless you are an expert in religion, atheism makes no sense.
by Ser Anneliese May 20, 2012
A rational personal conviction held by someone that theism is a falsehood.
"God is dead: but considering the state Man is in, there will perhaps be caves, for ages yet, in which his shadow will be shown." - Neitzsche
by JM December 17, 2004
Atheism is the lack of belief in God, or the belief there is no God. Depending on the atheist.
There have been subscribers of atheism that made communism did mass killings far greater than the Vatican, which isn't even Christian. Mao, Stalin, Lenin, Castro are just a few atheistic dictators who committed mass murder. Please don't say Christianity causes wars, because that's simply not true.
by oscarmarin1995 December 28, 2011
restore of good mental health, avoidance from religious obsessive compulsive disorders. Respect for common sense and individual liberty, subscription to secular humanism and/or nihilism.

a philosophy with the rejection of supernatural creation and the assertiveness that the universe evolved through steps and series of powerful natural forces.
he is so smart, what an atheism !

my atheist friend goes to university
by Pandora8732490427420674067 September 16, 2009
The belief that there was nothing and then nothing magically exploded for no reason, creating everything and then a bunch of everything magically rearranged itself for no reason whatsoever into self-replicating bits which then became dinosaurs
Atheism, like Christianity, makes perfect sense.
by bobby2345 June 30, 2011
The most logical theological position to take. The belief that god does not exist.
An example of Atheism? I don't know what to put here.
by GaleryonTheMystic December 08, 2007