Jean-Paul Sartre believed there was no world outside of our own self-consciousness, and once we die, then the world disappears as well.
If one considered a paper-knife, one would assume that the creator would have had a plan for it: an essence.
Human beings have no essence before their existence because, there is no Creator. Thus: "existence precedes essence". So, and just for that, the sartrian man with his freedom will become a god, but he'll remain always only a bankrupt god.