This paper present Martial Gueroult and Gilles Deleuze’s readings of the first eleven propositions of Baruch Spinoza’s Ethics and so their conceptions of God’s genesis by the articulation of a plurality of substances and their integration in the ens realissimum. After having dealt with Gueroult’s theory of substance of a single attribute, we stress the importance of the real distinction as key to the consistency of spinozist definition of God as ens realissimum, but also to its assimilation to a formal distinction by Deleuze as guarantor of the claim “pluralism = monism”. Then, we show that this approach is essential for a proper understanding of the nature of the attributes. Finally, we emphasize that those fundamentals aspects of Spinoza’s metaphysics remains centrals in Deleuze and Guattari’s metaphysic through their affirmation “God is a lobster” and their resumption of Riemann geometry.