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There are quite a few people in American history who have made important contributions to atheism, skepticism, agnosticism and religious critique through history. This page serves as an index to a series of short biographies of some of those individuals. Included here are historians, philosophers, statesmen, lawyers, scientists and more.

Although separated by time and profession, what unites them (aside from being American) is a common interest in reason, skepticism and critical thinking - in particular when it comes to traditional beliefs and religious dogmas. This has played an important role in the development of religion and theology over the centuries because the challenges and questions posed by these and similar individuals could not simply be ignored.

Bradlaugh, Charles

Darrow, Clarence

Dewey, John

Ellis, Albert

Haldeman-Julius, Emanuel

Hook, Sidney

Ingersoll, Robert Green

Lewis, Joseph

McCabe, Joseph Martin

Mencken, Henry Louis

Paine, Thomas

Sagan, Carl

Sanger, Margaret

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