Much of the answer to this depends on what you mean by 'atheism.' As the opposite of 'theism,' that form of atheism is just as dogmatic as what it seems to reject. The existential project looks at the event in the present in all its contingencies, so our relationship to a deeper or 'divine' reality might well be part of that. This a/theism does not affirm that there is a transcendent being who/that created the world and now controls what happens on it--that is a difficult reality to justify in the face of ever-increasing evidence of the uneveness or unjust realities that just happen...such a vision of the divine has to affirm the incompetence of the divine agent. But that does not mean that there is not a deeper or other dimension to reality which is related intrisically to our actions. Quantum physics, string theory, and the worke of Brian Greene and others have opened up this possibility, not as a necessity, as Hawking pointed out, but as an enrichment of the existential moment.