I recently watched 'The Big Kahuna' starring Kevin Spacey & Danny Devito. It's based on a play 'Hospitality Suite' and circles around two mature salesmen and a younger rep, hoping to land the big kahuna, as a client.
It explores interesting views, sales approaches and opinions on religion, but I think the entire film become a great work of production, from one of the final quotes by Danny Devito's character: "It doesn't matter whether you're selling Jesus or Buddha or civil rights or 'How to Make Money in Real Estate With No Money Down.' That doesn't make you a human being; it makes you a marketing rep. If you want to talk to somebody honestly, as a human being, ask him about his kids. Find out what his dreams are - just to find out, for no other reason. Because as soon as you lay your hands on a conversation to steer it, it's not a conversation anymore; it's a pitch. And you're not a human being; you're a marketing rep".