"Please say, 'so help me god'..."
"But I am an atheist..."
"Well, we have this secular version here, 'this I affirm under the pains and penalties of perjury'-”
"Well, actually I'm an agnostic, so I MIGHT accept some vague, latent teleological deistic/open-theistic/pantheistic/panentheistic force... maybe I should do the god version after all..."
"Whichever you like sir."
"But what if I think god is emergent and so WE are the first reasoning manifestation of god, then the authority WOULD be humanity and therefore the state- or what if it turns out that there IS a god, but it is amoral- OR... what if god is positively IMmoral, like Descartes' Cartesian demon? Then it might be completely appropriate to LIE to this kind of god or to EXPECT suffering from it... in fact, maybe even as an atheist I SHOULD choose the god option... because then I am ONLY accountable to god, whom I don't even believe exists to have authority, and NOT to the state, even if I do believe it has authority, but I have not sworn to it... right?!"
"Deputy! I think we have a situation here..."