Full Idea
In Spinoza's 'Ethics' one can substitute the word "Nature" (or "Substance", or even simply an X) for God throughout, and the logic of the argument changes little, if at all.
Gist of Idea
In Spinoza, one could substitute 'nature' or 'substance' for the word 'God' throughout
Source
report of Baruch de Spinoza (The Ethics [1675]) by Matthew Stewart - The Courtier and the Heretic Ch.13
Book Reference
Stewart,Matthew: 'The Courtier and the Heretic' [Yale 2007], p.236
A Reaction
This claim, if correct, is the clearest statement of why we should really consider Spinoza one of the first atheists, despite his endless use of the word 'God'.