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The lack of belief in a God/Goddess/gods. It does not mean that they accept science as a religion, nor does it mean they hate all others. There are prejudiced, racist, asshole atheists just like there are prejudiced, racist, asshole theists.
Christian #1: Hey, did you hear that Bill is an atheist?
Christian #2: Wow, we should all hate him, because atheism is the equivalent of believing in Satan! And Hitler!
Christian #1: No, man. He just doesn't believe in the Bible, and there is nothing wrong with that.

Atheist #1: Hey, did you hear that Joe is a Christian?
Atheist #2: Wow, we should all hate him, because Christianity is the equivalent of stupidity! And not believing any part of science!
Atheist #1: No, man. He just believes in the Bible, and there is nothing wrong with that.
by ImHeretoInform May 25, 2012
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The lack of belief in a deity or deities. Just that. Nothing else.

Atheism doesn't hold any answers to life's big questions. It won't tell you the meaning of life and it won't tell you how it all started. It's not a religion, not a philosophy, not a way of life. Atheism is quite simply *non-belief*.
#1: "I heard you're an atheist and don't believe in God, #2. If that's true then how did the universe begin?"
#2: "I don't know for sure. The leading scientific theory right now is the Big Bang theory, but that has a few problems and might not be correct."
#1: "If there's no God then where do we know right from wrong from?"
#2: "Again, I don't know for sure, but the general theory is that we evolved this feature because social creatures do better if unit cohesion isn't hindered by constant murdering."

Atheism isn't about answers. It's not really about anything, actually.
by mrbogart December 26, 2010
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Atheism, in fact, has NOTHING to do with Satanism. We do not all hate Christians. We're not all evil.

Besides, just by being intolerant and judgemental of Atheists, you are sinning. :)
" 'To be godless is probably the first step towards innocence,' he said, 'to lose the sense of sin and subordination, the false grief for things supposed to be lost.'
'So by innocence you mean not an absense of experience, but an absense of illusions.'
'An absense of need for illusions,' he said. 'A love of and respect for what is right before your eyes.' "
-Anne Rice, The Vampire Lestat.
by KP15 August 23, 2005
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Atheism is simply the opposite of theism. The prefix A means "without" or "not", so Atheism is simply a lack of belief in god(s). It is not a religion, just like theism is not a religion. Atheists are usually quite fond of life, since it is the only one we have.Theists if you think about it, need a god to make their existance make sense and to make them respect life.
That dog is an atheist. A new-born baby is an atheist. Most of the smartest people in the world are atheists. Coincidence?
by Nycto Achluo March 21, 2004
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Absence of belief in god(s).
Atheism is absence of belief in god(s). It is not necessarily belief that no god(s) exist. Just as asexual is absence of sex in reproduction, not opposition to sex or asymmetrical is absence of symmetry, not opposition to symmetry. Atheism is simple absence of theism.

Frequently people confuse the theism vs atheism question with the gnostic vs agnostic question. The word gnostic means pertaining to knowledge. It is a question about whether a person is certain or "knows".

Everybody is either theist or atheist and everybody is either gnostic or agnostic. There are agnostic theists. They believe god(s) exist, but don't claim to know for sure personally. There are gnostic theists. They believe and claim to know for sure that god(s) exist. There are agnostic atheists. They do not believe in god(s), but do not claim to know with certainty that no god exists. There are also gnostic atheists who claim to know that no god exists. It possible and quite common among atheists to not have been convinced of the hypothesis that god(s) exist without taking the position that no god exists.
by AllmanBros August 30, 2015
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A lack of beleif in God.
"I am an atheist because I do not beleive any gods exist. That's all that makes me an atheist."
by chrono khan June 12, 2003
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