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

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A religion based off a dot exploding and after the earth formed it rained on a rock for billions of years making a organism.Atheist usually say that it is not a religion, but if you think about they blindly follow a bunch of scientist and say whatever they say is true. They also like to use the term "you are unreleasable" as an excuse to stop talking to you when they are in a debate, but they are the ones being unreasonable as they will literally not talk to you because of your beliefs.
Random guy: I believe in Atheism .Random guy 2: I'm Cristian.(after long debate) Random guy: How can i talk to you when you are being so unreasonable?Random guy 2: I'm the unreasonable one?
by xboxjunkie February 24, 2015

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The belief that there was nothing, and then nothing happened to nothing, thus, everything that is and ever was in the world began to exist. Including every living thing on earth, which supposedly evolved from the same single-celled organism that magically appeared out of the aforementioned nothingness.
Atheism is proof that some people are just idiots. To refuse the idea that there is a "magical ghost" that created everything, while still claiming that everything you see comes from magic? Now, THAT'S what I like to call hypocritical, indecisive bullshit.
by The Zeldaniac January 09, 2015

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The rejection of theism, or belief that there is no omnipotent being that controls or created anything. The atheist leaves little to subjectivity beyond this, and generally only relies on what is observable and provable.

Atheism relies heavily on science for explanation. The only induction allowed in science is in the basic properties of matter that are so fundamental that they can not be proven to exist by anything else (the same way a statement can not cite itself as a proof), but are easily observable and thus held to be true. Science holds true only what can be observed.
by SpooneyMallard December 15, 2008

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A degenerative condition transmitted during observation and comparison of human beings with monkeys.
Infection may become more serious with knowledge of history and a study of psychology. Often coupled with a secondary infection called 'intelligence'.
"I graded out of Atheism, Carpentry and Shit-kicking."
by Crazy Otto September 17, 2005

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1) The belief that god does not exist, or a severe lack of faith in god. The advent of modern science and technology has slowly ebbed away at the belief god created everything, and has been on the rise since the mid 20th Century.
Once I believed in god, but the state of the world and new technology has made me look at this, and now, I have converted to Atheism.
by Sun-Won Kim December 25, 2003

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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

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some argue the state and atheists have cause over 100 million deaths. Nothing compared to the sheer number of deaths that have been cause by religion and theism in the past (crusades) and the simple halt of progress that the church has created (inquisition). Also, violence based on God continues today in the Middle East. But atheists are bad because they don't have faith in something that has no logical merit.
According to Roman Catholic tradition and scripture, one is to have faith in something without proof, like God or Jesus. However, I can easily say "I am Jesus 2005, follow me" and you must follow me without any logical reason or proof, because you're supposed to have faith. Makes sense.
by Original Name April 20, 2005

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