Existentialism

I think existentialism is a rather dark. Does it really belong to the humanist approach? It rejects religion then tells us to embrace our depressions. It feels more like philosophy than psychology, but maybe that's what psychology is. The topic is quite different from the scientific approach found in the learning perspective. The ideas of existentialism is very interesting and the debate it covers, over life and human nature, is more interesting than behaviorism.