yes, actually it IS who wrote it, in addition to how it's written. The two combined effects make the contract un-go-back-on-your-word-able...
Like say if I just drew up a contract. I was appointed by primordial elemental beings who came into existence shortly after the whole "Garden of Eden" incident. They would count as divine by your definition, and thus, being appointed by them, so would I.
But you all know I'm not divine. Just because I follow a divine order as Penultimate, doesn't make ME divine.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)