Understood, but again this is not an easy topic such as the example you gave between an Atheist and a Christian. This is something tangible which is still present and not something fictional or a belief.
This is what I was referring to in my last paragraph. We didn't discover concepts like country and nation, we invented them. They're very real and have a profound effect on our lives, but at the same time they are completely fictional. If everyone ceases to believe in them, they disappear.
