No, the moral Code of Hammurabi, from which the 10 commandments derive. Or maybe just the basic moral code of people: Do unto others as you would have others do unto you. It doesn't take a god to know what's right.
Do you really think religious codes change that? Look at the Inquisition, the mess of the Middle East, Ireland, 9/11, or pedophile priests/rabbis/preachers. I'm not saying religions CAUSE all of these things, but they don't seem to do anything to prevent them, either. If you think it's okay to kill someone because God told you to, you belong in an asylum, not a church.Maybe one problem is that in the absense of religious codes or any other commonly accepted codes many people go astray and do weird stuff, like killing other people, or wrecking the planet.