The Unbelievers

The Unbelievers is a 2013 documentary film that follows Richard Dawkins and Lawrence Krauss as they speak publicly around the globe about the importance of science and reason in the modern world, encouraging others to cast off religious and politically motivated approaches toward what they think to be important current issues. The film includes short statements by influential people and celebrities such as Stephen Hawking, Ayaan Hirsi Ali, Sam Harris, Cameron Diaz, Woody Allen, Penn Jillette, Ian McEwan, and David Silverman.

Gus Holwerda came to know Lawrence Krauss via Christopher Hitchens and first met him at an Origins Symposium. Being at the event, which they viewed as a kind of Woodstock for science, Gus and Luke Holwerda conceived the idea of following Krauss around on his lectures and debates and documenting his venture in the style of a rock band tour movie.The plan was not realized immediately, but Krauss approached the two, when the Origins Symposium wanted to archive its events. The quality of their work with Origins eventually convinced him to go on with the movie project, which fortuitously began, when Krauss and Richard Dawkins went on an Australian tour. ........

Source: Wikipedia