There are two kinds of existentialists: on one hand, the Christians, among whom I would include Carl Jaspers and Gabriel Marcel, both professed Catholics; and, on the other, the atheistic existentialists, among whom we should place Heidegger, as well as the French existentialists and myself. What they have in common is simply their belief that existence precedes essence; or, if you prefer, that subjectivity must be our point of departure.