Existentialism has little to do with faith or the lack thereof. By the time we consider adding Rilke, Kafka, and Camus, it becomes plain that one essential feature shared by all these men is their perfervid individualism. In order to understand the current meaning of existentialism, one must first understand that the American view of existentialism was derived from the writings of three political activists, not intellectual purists. The term was coined by Jean-Paul Sartre to describe his own philosophies. It was not until the late 1950s that the term was applied broadly to several divergent schools of thought.
Life is a series of choices, creating stress.
Few decisions are without any negative consequences. Some things are irrational or absurd, without explanation. If one makes a decision, he or she must follow through. Beyond this short list of concepts, the label existentialist is applied broadly. Even these concepts are not universal within existentialist works, or at least the writings of people groups as the existentialists .