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ATHEIST. One who denies the existence of God.
     2. As atheists have not any religion that can bind their consciences to speak the truth, they are excluded from being witnesses. Bull. N. P. 292; 1 Atk. 40; Gilb. Ev. 129; 1 Phil. Ev. 19. See also, Co. Litt. 6 b.; 2 Inst. 606; 3 Inst. 165; Willes, R. 451 Hawk. B. 2, c. 46, s. 148; 2 Hale's P. C. 279.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
I think an atheist, with all her experience of human monsters, was for her the depth of human depravity.
And certainly it is little better, when atheists, and profane persons, do hear of so many discordant, and contrary opinions in religion; it doth avert them from the church, and maketh them, to sit down in the chair of the scorners.
There is something besides all this, something which the arguments of the atheists can never touch.
The atheist spoke in a tone that, coming from him, was quite startlingly respectful, and even, as it were, huskily sympathetic.
Oh, don't say anything," cried the atheist cobbler, dancing about in an ecstasy of admiration of the English legal system.
But he nodded rather eagerly, being only too ready to explain the Gothic splendours to someone more likely to be sympathetic than the Presbyterian blacksmith or the atheist cobbler.
They were both atheists, with a depressing fixity of outlook but great mobility of exposition.
"I'm all on the side of the French soldiers like Dubosc, and I'm all against the French atheists like Hirsch; but it seems to me in this case we've made a mistake.
The atheist accuses the theist of believing in God without evidence.
As more and more middle- and upper-class people began to abandon Christianity in this era, they needed a term for their worldview that would distinguish themselves from their unrespectable atheist cousins.
Taiwan alongside Belgium and the Netherlands have been named as the best places in the world to live as an atheist by the International Humanist and Ethical Union (IHEU).
In the early 19th century, politicians and religious leaders used "atheist" as a catch-all term for rhetorical strawmen who were intent on dismantling the law and destroying American democracy.