Full Idea
Leibniz sailed closer to the winds of unbelief than Spinoza did.
Gist of Idea
Leibniz was closer than Spinoza to atheism
Source
report of Gottfried Leibniz (works [1690]) by Matthew Stewart - The Courtier and the Heretic Ch.16
Book Reference
Stewart,Matthew: 'The Courtier and the Heretic' [Yale 2007], p.293
A Reaction
This is an unusual view, but Stewart's view is that whereas Spinoza is always sincere in his writings, Leibniz is inclined to put a very conservative spin on his opinions. A key question for Leibniz is "Is God merely a monad?"