Most wouldn't die to the zombies....it'd be to all the diseases the corpses(dead and undead) give off like cholera. Most westerners would just die off from weakness since they couldn't go for more than a few days without getbig.com. City centers would be bombed by the military in an attempt to destroy as many zombies as possible.
The world's nuclear reactors would all meltdown since there'd be no one around to tend to them.
And, of course.....zombieism can of course be passed to animals. Not only would you have human zombies, disease, lack of food, and roving bandits, but zombie cows, sharks, pigs, and rats.