According to sociologists as of 2022, "the proportion of atheists in the US has held steady at 3% to 4% for more than 80 years." According to the Pew Research Center in a 2014 survey, self-identified atheists make up 3.1% of the US population, even though 9% of Americans agreed with the statement "Do not believe in God" while 2% agreed with the statement "Do not know if they believe in God". Other polling by Gallup in 2022 showed that 17% of respondents replied "No" when asked "Do you believe in God?", and another from 2023 found that 12% of respondents replied they "Do not believe in" God with 14% replying they were "Not sure about" the existence of God. Regardless of question or polling service, there is evidence the number of people not believing in God is increasing.
According to the 2014 General Sociological Survey, the number of atheists and agnostics in the U.S. grew over the previous 23 years. In 1991, only 2% identified as atheist, and 4% identified as agnostic; while in 2014, 3.1% identified as atheists, and 5% identified as agnostics.
In 2009, Pew stated that only 5% of the US population did not have a belief in a god and out of that small group only 24% self-identified as "atheist", while 15% self-identified as "agnostic" and 35% self-identified as "nothing in particular".
According to the 2008 ARIS, only 2% the US population was atheist, while 10% were agnostics.
One 2018 research paper using indirect methods estimated that 26% of Americans are atheists, which is much higher than the 3%-11% rates that are consistently found in surveys. However, methodological problems have been identified with this particular study; in particular, it has been posted that many people might not have a binary outlook to the question of the existence of God.
Accurate demographics of atheism are difficult to obtain since conceptions of atheism and self-identification are context dependent by culture.
A June–September 2014 Pew Research Center survey found that 69% of atheist Americans identity as Democratic or lean Democratic, 17% have no lean, 15% identify as Republican, 56% liberal, 29% moderate, 10% conservative, and 5% don't know. Among Americans who don't believe in god/gods, 65% identity as Democratic or lean Democratic, 17% have no lean, 18% identity as Republican, 50% liberal, 31% moderate, 13% conservative, and 6% don't know. That makes atheist and nonbelievers in god/gods Americans as belief groups to be the most politically liberal belief group in America and the least politically aligned belief group with Republicans and conservatism in the United States.
In 2014, a Pew survey found that 53% of Americans claimed they would be less likely to vote for a presidential candidate who was an atheist.
A October 2013 Public Religion Research Institute American Values Survey found 58% of American libertarians report they believe in a personal god, 25% believe god is an impersonal force in the universe, and 16% report that they do not believe in a god. It also found 73% of Americans who identify with the Tea Party report they believe in a personal god, 19% believe god is an impersonal force in the universe, and 6% report that they do not believe in a god. It also found 90% of white evangelical Protestants report they believe in a personal god, 8% believe god is an impersonal force in the universe, and less than 1% report that they do not believe in a god.
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