While I greatly respect Kierkegaard as a contributor to the theological discussion. He is no doubt existentialism's only hope for the possibility of an existential Christianity, which in my experience sounds absurd. I may be misunderstanding Kierkegaard. But even then, existentialism may have paved part of the road to postmodernity, it is NOT postmodern.
Existentialism is hypermodernity, still depending on signs and symbols to validate their beliefs.
But I don't like his work either. And even he, admits it. I guess Kierkegaard's great disappointment comes in how he attempts to separate out reason and faith. Faith, in his estimation, is a leap into the darkness devoid of our reasoning faculties. God desires the whole person.