In this paper I explore one issue in the history of German Idealism which has been widely neglected in the existing literature. I argue that Salomon Maimon was the first to suggest that Spinoza's pantheism was a radical religious (or 'acosmistic') view rather than atheism. Following a discussion of the historical context of Maimon's engagement with Spinoza, I point out the main Spinozistic element of Maimon 's philosophy: the view of God as the material cause of the world, or as (...) the subject in which all things inhere. I argue that this doctrine was the basis of Maimon's Law of Determinability. (shrink)