Certain doctrines, e.g., the virgin birth and the divinity of Jesus, are the necessary conditions of orthodox belief. A rose is a flower or it is not a flower. For existentialists, existence is mere consciousness and precedes essence. It is like a man who finds himself existing and then by a deliberate choice and act becomes essence. Consciousness transcends and gives meaning to the world of which it is conscious.
Moral decisions are similar to the creative decisions of artists in concrete situations.
In moral decisions, freedom is exercised. Responsibility is absolute. Man has no excuse. I did this thing. Contrasts with Analytic Philosophy favored by English-speaking philosophers.