I don't consider Jesus any more or less divine than anyone else; either we are all divine or none of us are. So what's left is the sentiment “Let him who is without sin cast the first stone” itself.
That Jesus didn't say “Let him who is without sin cast the first stone” doesn't matter. What matters is that someone said it. Someone thought it, and maybe some long forgotten scribe tried to make the world a more empathic place the only way he could: writing “Let him who is without sin cast the first stone” into the mouth of Jesus so people would listen.
If you're worried about hell, such a forgery is egregious. It can lead you dangerously “astray.”
But if you're looking for the thread of empathy that winds through our often brutal history, clinging to the rocks where it can, then maybe this forgery is heroic in its way, a testament to the creativity of the human spirit, evidence and reminder of the ethical consciousness–“divinity"--that unites us.