Is there any actual strict requirement that you have to swear over a document of some kind? I'd have thought swearing over the bible is a stand-in for swearing "before God", and that God would ultimately be your reckoner should you break your oath. If you don't have that meaning behind the oath, what is the point in using a book at all unless it's something meaningful like the constitution of your country, as another…
>If you don't have that meaning behind the oath, what is the point in using a book at all unless? the point is a childish rebellion against traditions the nation was founded on as a social signal to their in-group for validation. Might as well tip a fedora while giving the oath
As a protestant myself, give me an atheist pledging the oath over something they believe in (not in a religious sense here, but a personal philosophy sense) over an atheist making a mockery of religion by pledging the oath over something they don't believe in (and may detest).