He is going by the definition of 'a false belief or judgment about external reality, held despite incontrovertible evidence to the contrary, occurring especially in mental conditions' - hence his post #289.
I don't get the thing about people normally staying dead. That normally people do but Jesus didn't because he was divine is surely the point.
I'd say that the notion of 'God' qualifies as "a false belief or judgment about external reality" but that the nature of this particular claim is such that there can never be incontrovertible evidence to the contrary since the claim itself is incoherent - and that to request such evidence, as Vlad has, is an invitation to commit the NPF.
Jesus being dead and then not is an example of a specific claim that is contrary to external reality and I'd say that anyone who accepts that claim sees it as a special case and that, therefore, they are indulging in special pleading: but for me it is a clear unjustified false belief for which there is no credible supporting evidence.
While 'delusion' may not be often applied to religious convictions it is, in my view, not totally inappropriate when it is applied to unjustified false beliefs.