Atheists believe that god does not exist. To the point that they believe it an absolute truth, he cannot exist and there is no possiblity of it. Agnostic is someone who believes that there is not enough evidence for or against the existence of God, therefore he cannot be proven or disproven.
Now for the second part of my question for those of you who are agnostic. You do not deny that there is a chance that God can exist. If this is the case would you rather believe in God and be wrong or disbelieve in God and be wrong. Let's consider the ramifications of both. If you believe in God and are wrong then when you die you are dead and there is nothing else. You may have "waisted" some of your life believing in God. Now if you disbelieve in God and are wrong after you die you would spend eternity in pain and suffering.
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