Is "Jesus is God" necessarily true, necessarily false, or a contingent proposition? It has little or nothing to do with "identification" as ↪Terrapin Station erroneously asserts (but as usual does not explain). — Janus
What has to do with identification is "Jesus is God."
There's something we're calling "Jesus" and something we're calling "God." If they turn out to be the same thing, so that the identity statement "Jesus is God" is correct, was it the case that necessarily they turned out to be the same thing--that is, would they have to be the same thing in all possible worlds?
It's the same question as whether "Hesperus is Phosphorus" is a necessary identity.
And the issue I brought up is that if we believe that Hesperus is metaphysically necessary, does that have any implication for whether it's necessary that Hesperus is Phosphorus? I say that it does not.
Of course, I don't believe there are any necessary identity statements period. And a fortiori, I don't really buy the notion of rigid designation beyond it being a way of saying that particular individuals can stipulate rigidity for a way that they're going to use a term, no matter what. I'd agree that we tend to use proper names in a rigid way--once we christen a baby "Richard Milhous Nixon" we tend to continue thinking of and calling that person "Richard Milhous Nixon" whether he becomes president or a janitor, but we wouldn't have to.
That someone else--Spinoza, Kripke, etc. might disagree with me is irrelevant, unless someone has specified that they only want to know what Spinoza or Kripke would say.