I was introduced to Walter Kaufmann by my friend Julio while majoring in Philosophy at university (I believe I also majored in International Relations or some other useless field). Kaufmann was a top Nietzsche scholar and philosopher of religion, and I recall having read his following works: Nietzsche: Philosopher, Psychologist, Antichrist; From Shakespeare to Existentialism; Critique of Philosophy and Religion; and the trilogy Discovering the Mind (Goethe, Kant, and Hegel; Nietzsche, Hiedegger, and Buber; and Freud versus Adler and Jung). Kaufmann was born a Chrisitan in Germany (later emigrating to the US) and rejected Christianity at the age of 12 to become a Jew (only later to discover that all four of his grandparents had been Jewish).
At the risk of being totally ignored by either of the two people who occassionally (or accidentally) read this blog, I recommend that those interested in Philosophy or Religion read Kaufmann’s 1959 article “The Faith of the Heretic” published in Harper’s Magazine. Kaufmann explains his repudiation of Christianity (and basis therefor), and although he finds that the only two compelling religions are Judaism and Buddhism, he ultimately rejects those as well.