I don't know if a documentary is the best way to go about it. Maybe you should try some books, Richard Dawkins has done a few books. 'The God Delusion' has a lot of the arguments religious people use and he explains why they are don't hold up as arguments.
'The more I learn about people the more I like my dog'- Mark Twain
'You can have all the faith you want in spirits, and the afterlife, and heaven and hell, but when it comes to this world, don't be an idiot. Cause you can tell me you put your faith in God to put you through the day, but when it comes time to cross the road, I know you look both ways.' - Dr House
“Young earth creationism is essentially the position that all of modern science, 90% of living scientists and 98% of living biologists, all major university biology departments, every major science journal, the American Academy of Sciences, and every major science organization in the world, are all wrong regarding the origins and development of life….but one particular tribe of uneducated, bronze aged, goat herders got it exactly right.” - Chuck Easttom
"If my good friend Doctor Gasparri speaks badly of my mother, he can expect to get punched.....You cannot provoke. You cannot insult the faith of others. You cannot make fun of the faith of others. There is a limit." - Pope Francis on freedom of speech
'You can have all the faith you want in spirits, and the afterlife, and heaven and hell, but when it comes to this world, don't be an idiot. Cause you can tell me you put your faith in God to put you through the day, but when it comes time to cross the road, I know you look both ways.' - Dr House
“Young earth creationism is essentially the position that all of modern science, 90% of living scientists and 98% of living biologists, all major university biology departments, every major science journal, the American Academy of Sciences, and every major science organization in the world, are all wrong regarding the origins and development of life….but one particular tribe of uneducated, bronze aged, goat herders got it exactly right.” - Chuck Easttom
"If my good friend Doctor Gasparri speaks badly of my mother, he can expect to get punched.....You cannot provoke. You cannot insult the faith of others. You cannot make fun of the faith of others. There is a limit." - Pope Francis on freedom of speech
