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.
Fyodor Dostoevsky- What is a Socialist? - That's when all are equal and all have property in common, there are no marriages, and everyone has any religion and laws he likes best. You are not old enough to understand that yet.
Fyodor DostoevskyGentlemen, let us suppose that man is not stupid. (Indeed one cannot refuse to suppose that, if only from the one consideration, that, if man is stupid, then who is wise?) But if he is not stupid, he is monstrously ungrateful! Phenomenally ungrateful. In fact, I believe that the best definition of man is the ungrateful biped.
Fyodor Dostoevsky