virg, there's actually a big difference between Nietzsche and Hume. you're right that Hume was an atheist, but his philosophy falls into the field of epistemology, which basically strives to understand how we know what we know. in hume's case, he emphasized knowledge deriving from sense impressions, but that our perception - more so our ability to apprehend "things"/phenomena was limited --- and so there's a fierce skepticism in Hume. Nietzsche destroys the Humean paradigm of subject-object --- in the sense of person apprehending a world (Heidegger deals the death blow to cartesian/descartes thought). in hume's view, the world WRITES on human beings - which harks back to Descartes Tabula Rasa (blank slate notion). Nietzsche literally shatters the subject-object and substitutes "Will" and energy force unfolding "in" human beings. there is no external - no world - WE are life-world. Nietzsche's scheme conflates human and world, which is why he is so averse to perception.
sorry this is dense, i'm trying to sum a lot in a little time.

