Fair enough, I have already stated I am fine with the various definitions, but let's just be aware that the inclusion of the I don't knows and the inapplicables is arbitrary. It comes from distinguishing atheist as not theist. We could just as well define atheist and theist as not atheist.
As long as we are aware of the consequences of the definitions that we use and set the parameters I think we are fine. It is pointless to quibble over the definitions of we are all aware of the semantic nuances.
But that said, if we are all chiming in on how things should be categorized banana is not to fruit what unknown is to negative.