What does this passage mean? How does this idea influence the develop of man?

Question

“Atheistic existentialism, which I represent, is more coherent. It states that if God does not exist, there is at least one being in whom existence precedes essence, a being who exists before he can be defined by any concept, and that this being is man, or, as Heidegger says, human reality” (35).

Answer 1

It is a misstated or badly or erroneously described abstract context in which nature is discernible from nurture, the innate determinant from sense experience. e.g. 'It states that if God does not exist, there is at least one being in whom existence precedes essence, a being who exists before he can be defined by any concept' rather than 'once the first mover for the universe is no longer believed as an essence but is believed as a postulated description for which there is no continuous sense perception, then that human knows experience defines his essence after his existence is established or created.' Both are reditions are false by reason that human existence as human has as essence the knowledge of not human, to know human is more than that is not human.