It’s a mute point. It certainly supports James’ argument but then his argument is a dead-end argument he keeps falling back on. Well, it’s a dead-end unless you are an atheist who believes that all things in the world will continue just as they have since the beginning of human history. Christians, as a rule do not. Atheists do.
I think your not looking at the same map; the map I show has the Christian religion dominating and expanding around the world; not the other way around.