This book spotlights individual expressions of atheist, agnostic, and secular humanist opinion—both public and private—to shed light on the phenomenon of religious disbelief throughout history and across cultures. Voices of Unbelief: Documents from Atheists and Agnostics is the first anthology to provide comprehensive, annotated readings on atheism and unbelief expressly for high school and college students. This diverse compilation brings together letters, essays, diary entries, book excerpts, blogs, monologues, and other writings by atheists and agnostics, both through the centuries and across continents and cultures. Unlike most other anthologies of atheist writings, the collection goes beyond public proclamations of well-known individuals to include the personal voices of unbelievers from many walks of life. While readers will certainly find excerpts from the published canon here, they will also discover personal documents that testify to the experience of living outside of the religious mainstream. The book presents each document in its historical context, enriched with an introduction, key questions, and activities that will help readers understand the past and navigate current controversies revolving around religious belief.