Some labels assume action.
For example, before I got a nursing job, I would tell people I was a nurse because I had the license and the title. The next question was inevitably, "Oh, where at?" The label of "nurse" assumed that I was, somewhere, somehow, actively being a nurse.
I believe that to me, the title of "Christian" should be the same way, a label that assumes action. That by carrying the title, you are somewhere, somehow, actively being a Christian. Whether you are in the unreached parts of the world telling the good news or simply spending your time actively and intentionally loving others around you, you are earning that label.
So when we say that we are Christians, let us live in such a way that their next question will logically be, "Oh, where at?"
Does that make any sense?