Existentialism isn't so atheistic that it wears itself out showing that God doesn't exist. Rather, it declares that even if God did exist, that would change nothing.
Actions are sometimes performed in a masterly and most cunning way, while the direction of the actions is deranged and dependent on various morbid impressions - it's like a dream.
Reality is infinitely diverse, compared with even the subtlest conclusions of abstract thought, and does not allow of clear-cut and sweeping distinctions. Reality resists classification.
The chief thing is to love others like yourself, that's the chief thing, and that's everything; nothing else is wanted - you will find out at once how to arrange it all.