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The point is, the only measure of "certainty" that appears in the scale is concerning the actual appearance of a belief. Those who are "uncertain" are Apatheists. Those who are not "uncertain" are atheists / theists. If you have a belief (or disbelief) then according to our scale, you already have a measure of certainty about that belief that distinguishes you from the apatheists. That is where we stop measuring certainty and focus on the other elements (i.e. the actual belief, and how you view the strength of the arguments for your belief).
The only separating factor between a 4 and a 5 is whether you think the non-existence of Gods can or cannot be conclusively established (note the word "conclusively", it is important here). Similarly, the only separating factor between a 1 and a 2 is whether you think the existence of Gods can or cannot be conclusively established (again, note the word "conclusively").
It's a case of "you either think the arguments conclusively establish existence (or non-existence) or you don't" in much the same way as people have argued "you either believe or you don't". I'm sorry if that forces some people together, despite the fact they may feel "more certain" in some way, but we wanted a simple scale that could classify according to actual beliefs, not the subjective certainty behind those beliefs, since everyone ultimately measures their certainty in different ways.
Hmmm... I'm not convinced.
All you've done here is shift the burden of your argument from the word 'certainty' to the word 'conclusively'.
Either you're equating 'conclusively' to absolute knowledge/ certainty, or you're not.
In the first case, then no one can know anything conclusively, because no one has absolute knowledge. Your 5-point scale becomes a 3-point scale (positions 2, 3 and 4).
In the second case, 'conclusively' represents some degree of certainty. But what degree? We're back with trying to shoe-horn a continuous variable into a set of 5 discrete values, which just doesn't work.
He who desires to worship God must harbor no childish illusions about the matter but bravely renounce his liberty and humanity.
Mikhail Bakunin
A casual stroll through the lunatic asylum shows that faith does not prove anything
Friedrich Nietzsche