This paper intends to interpret and criticize Sartrean humanism, by comparing Existentialism and Humanism published in 1946, and the dialogue with Benny Lévy entitled Hope Now published in 1980. Benny Lévy once criticized that Sartrean statement of humanism was contradictory in these two articles. Is his interpretation of humanism truly contradictory, as Lévy said? Besides, has the "humain reality" circumvented the universal concept of humanity (the concept of human beings), and already departed from the restraint of transcendental philosophy, and become the subjectivity living as "existence precedes essence"? Does he really succeed in accomplishing the atheistic existentialism that he wants to pursue? What is his relation with the theological tradition? Does Sartrean intersubjectivity (l'intersubjectivité) make his thought sink into another sense of solipsism? These will all be the questions that this paper attempts to respond.