Disbelievers, around 3-12 million, non-believers well over 40 million.
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Some polls put religious belief in the USA as high as 90%. That's much higher than in any European country. Trying to determine the number of atheists in any country is difficult: but in a country which has so many religious fundamentalists, it would be impossible to gather any accurate figures.
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A new Gallop polls showed that upward of about 15% of the American population, roughly twenty million Americans, are atheists.
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Estimations for open atheists are about 160,000,000. Closet atheists could account for much more, hundreds of millions or perhaps billions, but then again they could account for few, such as thousands. The exact number may never be known since in some cultures being an atheist is punishable by death.
It's hard to figure out how many atheists are in the country since on most polls, Atheism falls under the "no religion/affiliation" option. As such, it's generally agreed upon that 8-15% of the U.S population is non-religious which includes atheists, agnostics, skeptics of any kind, and just people that don't care.
The term is non-existent. Either a person is agnostic or atheist, not both.
In some senses, agnosticism is a stance about the difference between belief and knowledge, rather than about any specific claim or belief. In the popular sense, an agnostic is someone who neither believes nor disbelieves in the existence of a deity or deities.
A theist believes in the existence of a deity or deities, while an atheist disbelieves (does not believe in) the existence of any deity or deities at all.
There is no specific number, as anyone could change their religion anytime. There are quite a bit, however.
A BBC poll in 2004 gave 9% as the number of atheists in the USA.
Estimates will probably vary - it depends a lot on the definition of "atheists". I believe www.adherents.com may give you estimates from different sources.