Emmanuel Itier produced and directed the film, which explores the notion of faith and god and shot in multiple locations around the world.
Jim Carrey, Deepak Chopra are among a cast of dozens of celebrities, religious thinkers and academics who contribute.
'[Lightning has] proven with the sale of What The Bleep Do We Know that there is a viable and commercial market for this type of product,' Itier said. 'It has been an enlightening journey.'
Lightning Entertainment's Richard Guardian, Rich Goldberg and Joe Dickstein and corporate counsel Megan Holstein brokered the deal with attorney Steven G Kaplan on behalf of Itier.
Lightning's Cannes Market includes Jada Pinket Smith's The Human Contract, coming-of-age comedy Hey Hey, It's Esther Blueburger and psychological thriller Anamorph starring Willem Dafoe.