I'm going to share Spinoza's God.. with some Wiki quotes.
Spinoza argued that God and Nature were two names for the same reality, namely the single substance (meaning "to stand beneath" rather than "matter") that underlies the universe and of which all lesser "entities" are actually modes or modifications.
Spinoza contended that "Deus sive Natura" ("God or Nature") was a being of infinitely many attributes, of which extension and thought were two. His account of the nature of reality, then, seems to treat the physical and mental worlds as two different, parallel "subworlds" that neither overlap nor interact. This formulation is a historically significant panpsychist solution to the mind-body problem known as neutral monism. The consequences of Spinoza's system also envisage a God that does not rule over the universe by providence, but a God which itself is part of the deterministic system of which everything in nature is a part. Thus, God is the natural world and has no personality.
Spinoza has had influence beyond the confines of philosophy. Albert Einstein named Spinoza as the philosopher who exerted the most influence on his worldview (Weltanschauung). Spinoza equated God (infinite substance) with Nature, consistent with Einstein's belief in an impersonal deity. In 1929, Einstein was asked in a telegram by Rabbi Herbert S. Goldstein whether he believed in God. Einstein responded by telegram "I believe in Spinoza's God who reveals himself in the orderly harmony of what exists, not in a God who concerns himself with the fates and actions of human beings."
http://en.wikipedia.org/wiki/Baruch_Spinoza