Any time the word is not used as a proper and reverent noun referring to the central figure of the Judeo-Christian Scriptures.
In any case, changing the proper noun Deity to the common noun deity is not legislated, it is a matter of customary use, determined by the grammarians of the culture of the written language. Pretty obviously, when spoken, the word attains its nobility from the context. You can't capitalize a spoken word, or punctuate a spoken sentence.
I understand. I was just doing a poor job of pointing out the absurdity of how language is being used to push an ideology and political agenda.