The Oracle pursued a logical course of confuting theism, and leaving 'a-theism' the negative result. It did not, in the absurd terms of common religious propaganda, 'deny the existence of God.' It affirmed that God was a term for an existence imagined by man in terms of his own personality and irreducible to any tenable definition. It did not even affirm that 'there are no Gods'; it insisted that the onus of proof as to any God lay with the theist, who could give none compatible with his definitions.
J.M. Robertson, A History of Free Thought in the Nineteenth Century V1
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