An Atheist Manifesto by Sam Harris is a short, sharp 2005 essay, in it Harris argues that atheism is not a belief system but simply the refusal to deny the obvious: that the scale of human suffering makes belief in an all-powerful, all-loving God untenable. Using examples ranging from everyday atrocities to disasters like Hurricane Katrina, he contends that religious faith requires people to ignore evidence, and that any God who permits such suffering is either impotent or morally unworthy.

The piece is characteristically direct, lucid, and unapologetic. Its strength lies in the clarity with which it frames the problem of evil and refuses theological special pleading; its limitation is the same uncompromising tone that can feel more like a declaration of war than an invitation to dialogue. For readers already sympathetic to secular reason it remains a bracing and memorable statement.