What does God, or rather the idea of God, look like in Deleuze’s system of philosophy? Mostly like nothing at all. God doesn’t appear in the main body of the book on Foucault. Instead, God appears in the appendix which is a historical survey. As described in Foucault, the force of infinity, the classical, 17th century idea of God is the “unfold” of human finitude. All the human forces are raised to infinity, allowing the human person to emerge “only between categories of infinity” (p.73).
“Unfold” is a peculiar usage for Deleuze. His thought has as its focus “the fold,” not “the unfold.” God would be the unfolding of the human person, leaving the latter lost and tossed about in infinity, trying to find a place, the place of an inside, the finite inside or the other side of the infinite outside. In the 17th century conception, the more perfect power will pass through the human element. The forces within “man” carry over into a relation with “forces from the outside.” (p.100) The baroque God is described as “the universal explanation and supreme unfolding.” (p.101)
Not-metaphysical, this outside is the outside of an inside, or rather the other side of the same single line, or plane of immanence. This idea is indebted as much to Feuerbach as to Spinoza. It is the former about whom Deleuze says he owes the idea that “God has never been anything but the unfold of man,” and also the consequent idea that “man must fold and refold God” (p.103).
Deleuze calls these ideas “classical,” but he means the 17th century, which means baroque. The degree to which they might be our own depends upon the degree to which our own age is ne0-baroque. Ultimately this means deciding the difference between the substance monism of Spinoza and the substance pluralism of Leibniz. What I love about Deleuze is that he always give you something with which to work.