"ANT"-i-matter... tee hee
Lol the antimatter always cracks me up. Never mind that the energy produced by the body of a few billion people would blow the whole Earth to atoms. They think the antimatter would simply erase completely the matter out of existence.
Let's say 4 billion people are eaten by birds, that leaves ~3 billion to antimatter, or 195 billion kilogramms. Antimatter has mass too (yep Cirus, and it's not negative mass either ), so that's ~400 billion kg. I'm lazy to calculate E = mc2 now, but acc. to wiki (http://en.wikipedia.org/wiki/E%3Dmc2) 1 gramm of mass equals 21.5 kilotons of TNT (or roughly about the energy of the Fat Man nuclear bomb exploded in Nagasaki).
Which leads us to a grand total of energy equivalent to 400 thousand billions of Fat Man explosions, or roughly 400 billion Castle Bravo explosions, the most powerful weapon ever created by man (which has 22 megaton TNT).
And they're afraid of the few hundred nuclear bombs now ready to detonate. Just wait and see what your god has in his silos for you! :D