Ask Lemmygrad

I've always found (in my experience teaching first year uni science students) teaching something directly, especially if it goes against someone's fundamental understanding, is not very fruitful.

So saying "we are a product of the world we live in" might help, but usually isn't too effective.

If you ask probing questions that lead to the person discovering reality themselves, that is a lasting impression. Trust that people are smart and capable. Even if they do dumb things (we all do).

Example would be asking someone what causes the seasons on Earth, and getting them to reason it out. Albeit, a non-political question is easier, the same tactics can be used for anything really.