Links to websites of interest:

American Freethought film series
http://www.americanfreethought.tv/

The Truth Seeker videos
http://thetruthseeker.us/

Truth Seeker Publishing
http://truthseekerpublishing.com

The Truth Seeker Company/Prints
http://thetruthseekercompany.com

Robert G. Ingersoll
http://thegreatagnostic.com

The Champions of the Church: Their Crimes and Persecutions
https://archive.org/details/championsofchurch00benn/

A Short History of the Inquisition
https://archive.org/details/ashorthistoryoft00macduoft

Thomas Paine National Historical Association
http://www.thomaspaine.org/

Thomas Paine Videos
http://tpnha.org

Golden Age of Freethought
http://goldenageoffreethought.com

Humphrey-Bennett Discussion
https://archive.org/details/christianityin00hump

UK Organization Challenging Religious Privilege in Public Life
http://churchandstate.org.uk

The Freethinker
http://freethinker.co.uk/