...nothing. It would only be lost all over again. Everyone should understand that all governments are a convention we've made. It is in the same category as a religion, but one where we've set up the ground rules and requires no worship. There is no rule of nature that says common-sense principles cannot fail, or that you cannot be persuaded to go against principles you once held. The Bill of Rights will absolutely fail if you don't dislodge the notion that human rights can exist without a reference to God. It is axiomatic. Individual liberty is not a scientific law, or a math equation. When you remove God, you empower the tyrant element in all of us. This ultimately aggregates until you have a society that disdains liberty and is all about the "collective."

Even if you are a non-believer, try to appreciate the function of this thing. God, as a point of reference, simply establishes that we are all on equal footing. It requires no worship, nor establishes a religion. Human liberty and freedom under a government cannot exist any other way. Anything else is human-based, and therefore, relative (and given to the whims of whomever holds the most power).