not for the religious only
perhaps you thought that German philosophy was something that Nietzsche introduced and Kant and Hegel defined.
Think again. This is the source, the quellen, of Nietzsche's fanaticism, and the stern dungeon of Kant's cosmopolitainism.
If you've gotten this far you have only to add Schiller, Schlegel, and Scheliermacher; and you, are halfway through the three H's: (Hegel) Heidegger, and Husserl.
That one can get this far, for such a price is practically a miracle.