The God Conspiracy by Derek Gilbert

One e-mail. Five lines. 4,000 dead. And it is only just beginning… When a small boy in Iowa forwards a mysterious email from 'God' to a small group of friends, he unwittingly releases a trigger that sends blood pouring throughout his farming community. Thousands more are dead across the country in dozens of simultaneous terror attacks and the government blames fundamentalists who want to trigger the Apocalypse. FBI Agent Joe Unes reluctantly teams with reclusive Internet radio host Barney Ison (from Sharon K. Gilbert's The Armageddon Strain) to expose the plot -- and discovers that he's not contending against flesh and blood.