Questions on Existentialist Ethics

1. According to Kierkegaard, what is it about "inauthentic" existence that makes it immoral?
2. If, as Kierkegaard claims, truth is subjectivity, then how can there be "core values" for an existentialist ethic that do not reduce morality to subjectivism?
3. What is the difference between Kierkegaard's aesthetic, ethical, and religious stages of life?
4. How, according to Nietzsche, do the Christian values of herd morality (e.g., compassion, self-sacrifice) contradict the noble moral impulse to move "beyond good and evil"?
5. According to Sartre, how can freedom and responsibility be principles for making moral judgments?