I don't need to believe in gods in order to demand that my government treat people as I expect they should be treated. Nobody does, though if some do, that is fine as well. Arguing that there are no unalienable rights because there is no gods is missing the point, unalienable rights are whatever we demand them to be. As sure as any hypothetical god could demand there be unalienable rights, so can we.
This means that we will never all agree on an unalienable set of rights, but so what? With apologies to Sir Charles Napier, let us all act according to our own sense of morality.
The point that the Christian makes is unalienable rights are given by God Himself, and that no human authority can take them away. You and I are valuable because we are made in the image of God.
Without God, all morality and ethics are completely voluntary.
This means that we will never all agree on an unalienable set of rights, but so what? With apologies to Sir Charles Napier, let us all act according to our own sense of morality.