God, Deity, Extension

Insofar as Spinoza's use of 'God' is to name the object of Descartes' worship, his propositions 'God exists' and 'God possesses Extension' are expressions of agreement and disagreement, respectively, regarding that entity.  However, for Spinoza, 'God' denotes an Idea', which indicates that what it represents is, more accurately, a concept of Deity.  Thus, the fundamental target of his divergence from Descartes is the latter's concept of a Deity as fundamentally a guarantor of the reliability of Perception, which he replaces with that of a Deity as fundamentally a source of empowerment, i. e. achieved when a Mode subsumes itself under that Idea.  Similarly, Kant's alternative is that of a rewarder of Virtue, while Socrates' 'impiety' consists in his challenging the prevailing concept of Deity.  Accordingly, for both Descartes and Spinoza, the status of Extension is derivative--Perception, for the former, is unextended, while Action, for the latter, requires Corporeality, and, hence, Extension.  So what is more historically radical in the Ethics is not the attribution of Extension to the Medieval, and the Cartesian, object of worship, but the liberating establishment of the function of Philosophy with respect to any such object, which of Spinoza's successors, only Alexander seems to explicitly appreciate, i. e. in Nietzsche' 'God is dead' formulation, 'I repudiate the prevailing concept of Deity' is only implicit.