The United States is becoming less religious. Though still a predominantly theist country, the portion of the population that identify as not religiously affiliated has risen to 23%, and of these, about a third do not believe in God. This has generated much conversation about what it means to be atheist or agnostic.
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Read more about agnosticism and atheism:
Pew Research Center: U.S. Public Becoming Less Religious
Slate: An Agnostic Manifesto