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In 2014, Carroll participated in a highly anticipated debate with philosopher and Christian apologist William Lane Craig as part of the Greer-Heard Forum in New Orleans. The topic of debate was "The Existence of God in Light of Contemporary Cosmology." Carroll represented Team Naturalism, with Alex Rosenberg and Tim Maudlin. Craig represented Team Theism, with Robin Collins and James Sinclair. A book has been published containing the transcript of the debate and the following Questions and Answers session on the second day of the event.