I believe it is an allegorical song. On the surface it's about Napoleon - hence the cover a painting by Delacroix, who was contemporary W. Napoleon, who crowned himself as emperor. The French revolutionists' cry was " Viva la republique" - the republic W. The seperation of church/faith and state -(" Viva la vida"). I believe it's a comment on the way the us has been lead by politicians who claim to have God on their side, as an argument for dictating the right kind of democracy around the world - very clever and political song if you look closer.