Mando writes: "Don't they mean 'The Individual Nature of Belief'"
Something like that is what they SHOULD mean. But notice that philosophers repeatedly announce their topic with a reifying 'THE' right up front: "THE concept of existence", "THE concept of evil/freedom/salvation" etc. They erroneously assume there are fixed, determinate, and definite GENERIC concepts, like "pure forms" up in some kind of Platoland. The best they can hope to examine is 'Individual Notions of the Nature of Belief'. They do have the right to STIPULATE a notion they want to examine. They need to describe it in detail, introduced with a line like, "This is the notion of 'God' I want to talk about." They then are counting on their description occasioning in you, the reader, something close to the notion they have in mind. But such stipulation is not creation. It cannot create "real" -- not simply notional -- heavens, angels, words, or mind-independent meanings and concepts.
