Panatheism

Panatheism is the assertion that no god or gods exist and given that then nothing can be correctly termed holy or be considered sacred.

The term Panatheism is also used to reference Pan or "All" Atheism which holds the position that all people are Atheists to at least one or more god models.

“I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours.”
Stephen F. Roberts

"None of us would seriously consider the possibility that all the gods of homer really exist, and yet if you were to set to work to give a logical demonstration that Zeus, Hera, Poseidon, and the rest of them did not exist you would find it an awful job. You could not get such proof.

Therefore, in regard to the Olympic gods, speaking to a purely philosophical audience, I would say that I am an Agnostic. But speaking popularly, I think that all of us would say in regard to those gods that we were Atheists."
Bertrand Russell

References

* [http://dictionary.reference.com/browse/panatheism Dictionary.com for Panatheism]