It is good that you are reading what other atheists have to say but please remember that they are usually not Satanists. My essay is short and I assume you do want to know the precise sense in which we use the word atheist. Just a suggestion to clarify your understanding.
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Magister Nemo's Satanic Offerings:
DISCOVERING THE SATANIC GOD - The heart of Satanism.
THE SEVENTH TOWER OF SATAN - Ritual in virtual reality.
BENEATH THE SEVENTH TOWER OF SATAN - Deeper VR ritual.
THE FIRE FROM WITHIN - My book.

My 9sense audio interview on GREATER MAGIC