And who is it that determines the criteria? What is an important point to one is not to another.
So I put it to you, PA: what, other than the name, distinguishes a Christian from a non-Christian?
Would, at least most, other Christians agree with whatever answer you propose?
Can that definition/description serve to show an outsider who is/is not a Christian?
Let's suppose that some test like the one above showed that there really was a god. What would that do to your beliefs/disbeliefs? You just said that such tests aren't valid. Would that one also be invalid?