法国存在主义里的宗教爭論要明晰得多:马賽尔(Gabriel Marcel)是一个改皈天主教的人,沙特是一个不妥协的无神論者。在法国,存在主义实在是一个猛烈的神学、哲学爭論的风暴中心,連马克思主义者也参加进來,指斥存在主义是“资产阶级个人主义”的最后表現。马賽尔虽則极其欽佩雅斯柏斯,但是他的存在主义却是独立得來的,是把自己从唯心論下面解放出來的斗爭結果。这个斗爭在他的《形而上学日 Religious controversy in French existentialism is much clearer: Gabriel Marcel is a convert to Catholic, and Saudi Arabia is an intransigent atheist. Existentialism is a fierce theology in France. The center of the storm of philosophical controversy, even the Marxists, joined in and denounced existentialism as the last manifestation of “bourgeois individualism.” Although Marcel admired Jaspers very much, his existentialism came independently and was the result of the struggle to liberate himself from the idealism. This struggle is in his “Metaphysical Day.”