[liber8]

This is not what pumaontheprowl said.

You are right, simply presenting people with data doesn't work. If it did, you would never see a fat nurse, or a doctor who smokes, or... the list is endless.

pumaontheprowl's suggestion is to design a (thought) experiment that involves the skeptic. There are various ways to do this, but history is literally built on this exact phenomena. Getting people to change their mind on an issue requires that you have a real conversation with them. You can't just shove data in their face and see "See, look dummy you're wrong I'm right!" There are all sorts of people that do this for a living: helping people leave cults/white supremacy groups/etc.