That seems like a really tortured definition/interpretation/understanding of ’belief
If there is an ambiguity in natural language, then an attempt unpick it will look unnatural.
Consider a situation where two theories are equally supported by evidence. If a physicist backs theory A over theory B that would be the kind of belief that Sabine is rejecting.. I think.
I agree with respect to classification but not for demarcation – if it’s unclear how to demarcate two entities isn’t it unclear whether two entities exist (versus one or none)?
In this and your other examples, one can adopt an arbitrary classification scheme, and then the question of whether the posits of the scheme exist can be settled straightforwardly. So problems of existence are not problems of existence per se but problems of classification.
If there is an ambiguity in natural language, then an attempt unpick it will look unnatural. Consider a situation where two theories are equally supported by evidence. If a physicist backs theory A over theory B that would be the kind of belief that Sabine is rejecting.. I think.
In this and your other examples, one can adopt an arbitrary classification scheme, and then the question of whether the posits of the scheme exist can be settled straightforwardly. So problems of existence are not problems of existence per se but problems of classification.