This article is from the Atheism FAQ, by mathew meta@pobox.com with numerous contributions by others.
The short answer is "No, do you?"
Many atheists have been atheists for years. They have encountered many
arguments and much supposed evidence for the existence of God, but
they have found all of it to be invalid or inconclusive.
Thousands of years of religious belief haven't resulted in any good
proof of the existence of God. Atheists therefore tend to feel that
they are unlikely to be proved wrong in the immediate future, and they
stop worrying about it.
 
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