Comment Re: If you say your Christian, you are Christian. (Score 2) 229
That is definitely the correct usage. Literally from the Greek:
a-1 + Gnostic.
(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested in 1870; coined by Thomas Huxley. Either from Ancient Greek (agnstos, "ignorant, not knowing") or from a- + Gnostic. Deriving (either way) from Ancient Greek - (a-, "not") + (gignsk, "I know"). (Wiktionary)
I suspect the idea of a middle ground came from the idea of it not being committing fully to disbelief or to belief.