Let me clarify something as I begin this piece: I'm not writing in support of Christianity. My own feeling is that the strongest relationship one can have with God is voluntary. That's why I oppose any religious state, Christian, Jewish, Muslim or other. It's an insult to the connection with God to have the state compel that connection.
Belief in God is not required to support the Unite pledge, and the idea of a Global Bill of Rights. Freedom of Religion, as it is written in Article 8 of the draft document, creates the right to have no religion.
Still, the marketplace of ideas includes discussion about God and religion. In that vein, I suggest that Jesus would sign the Unite pledge.
Why, because of what he said. Let's start with the "golden rule" Matthew 7, verse 12 "...however you want people to treat you, so treat them." A Bill of Rights at its core is an agreement to treat others as you expect to be treated. Unite makes this agreement enforceable through courts.
And why courts? Cannot human character be trusted? Sometimes yes, but often no. Rousseau was only half right when he had his epiphany walking from Geneva to Paris and realized that men are inherently good -- it's the social institutions they live in that make them bad. Humans are half good and half bad, in equal proportion. It's the social contract they design, in this case a Bill of Rights, that brings out the good, or accentuates the bad.
Let me give you an example:
Jesus says "Do not lay up for yourselves treasures up earth, where moth and rust destroy and thieves break in and steal." Matthew 6, verse 19. Jesus would sign to moderate those who would lay up vast treasures for themselves even as the majority of humans live in squalor. A system that brings out the best creates well being for all, not financial equality for all. His one violent act was to overturn the tables of the money changers.
And finally we have the death penalty. How can any Christian support the death penalty? Jesus wouldn't. He would say "...whoever slaps you on your right cheek, turn to him the other also" Matthew 5, verse 39. This is not out of weakness, but out of strength, just as Gandhi and King followed this advice into beatings and into victory.
Yes, Jesus would sign the pledge, the real question for anyone is will they too, and if not, why not?