Existentialism
"Existentialism, in a hilariously reductive nutshell, believes the following: Human existence is absurd. There is no 'higher power' or deity or meaning to be found beyond the fact of that existence, and this condition fills us with dread and anxiety. The movement's overall goal (though the details vary from writer to writer) was to make sense of what we can do in the face of that absurdity, dread, and anxiety."
(Source: Schur, p. 210)
Mother Forkin' Morals with Dr. Todd May - Part 1: Existentialism (The Good Place)
Stanford Encyclopedia of Philosophy
Further Reading
Existentialism by 
The A to Z of Existentialism by 
Albert Camus by 