codarac wrote:
I would have thought that anyone who was not religious would surely come to the conclusion that the universe does not care about them, and that there is nothing to stop them creating their own value system, which seems to be the idea at the heart of existentialism
Right, well, there is more to the matter than that. Existentialism is a movement in continental philosophy including a set of intellectuals, themes, and ideas. Atheism does not necessitate being an existentialist though, as atheism has preceded existentialism, and because a large number of atheists will work with different themes and ideas as their focus.