Atheist Day

Atheist Day exists in part because of an internet joke. In 2003, a satirical story went viral claiming a judge had told an atheist plaintiff that April Fools' Day was already their holiday. The story was fictional, but it stuck. When secular organizations formalized the observance in 2009, they deliberately chose March 23 to distance it from the punchline.

The holiday now serves a more substantive purpose. The share of Americans identifying as atheist has doubled since 2007, and the broader category of religiously unaffiliated adults has reached 28% of the population. Atheist Day marks a demographic shift that is reshaping American civic life.

Atheism in America did not start in the 21st century. The period from 1860 to 1900 is known as the Golden Age of Freethought, when public intellectuals openly questioned religious authority and traveled a national lecture circuit that drew large audiences. The movement had enough momentum that by 1925, the American Association for the Advancement of Atheism became one of the country's first formal organizations dedicated to nonbelief.

The American Humanist Association followed in 1941, broadening the secular movement beyond atheism into a philosophical framework that emphasized ethics without religion. These organizations laid the groundwork, but atheism remained largely invisible in mainstream American life. That changed with one person.

The most hated woman in America

Madalyn Murray O'Hair was a Baltimore mother who challenged the practice of mandatory Bible reading in her son's public school. Her case, Murray v. Curlett, reached the Supreme Court in 1963, where it was consolidated with Abington School District v. Schempp. The Court ruled that officially mandated Bible reading in public schools was unconstitutional.

That same year, O'Hair founded American Atheists. In 1964, Life magazine called her "the most hated woman in America." She was confrontational, litigious, and unapologetic. She pursued cases to remove "In God We Trust" from currency and to revoke tax exemptions for churches. She remained the public face of American atheism until her death in 1995.

From internet joke to formal observance

In 2003, a satirical internet story claimed a judge had told an atheist plaintiff that April Fools' Day was already their holiday, citing the biblical verse "The fool says in his heart, 'There is no God.'" The story was entirely fictional, but it spread widely enough to permanently link atheism with April 1 in popular culture.

When the Spanish Union of Atheists and Freethinkers organized the first formal Atheist Day in 2009, they chose March 23 specifically to break that association. The date gave the observance its own identity, separate from any punchline. Organizations including Atheist Republic and the International Coalition of Ex-Muslims subsequently adopted it, turning March 23 into a global day of visibility for nonbelievers.