The evidence is that God does exist, that he has revealed himself, his name and his purposes through his Word, the Bible.
If don't believe the Bible and don't apply, you are guided through the pitfalls of this life in believing a lie
To illustrate this difference, made by these existentialists to argue against the traditional proofs for the existence of God; atheism is simply taken for granted. Such atheism could explain the morbid gloom, the heightening anxiety, and the sheer absurdity of life that one often finds in existentialism .
The absence of God makes death an absolute, an absolute that is regarded by some as an absurd stupidity, by others as a ludicrous monstrosity extreme emphasis on the dark side of human existence.
Yes frustration, annoyance, and sorrows are part of all human living, but existentialism seems centered on them. There is very little joy and gladness in atheism.