Isaiah 47:5 Sit thou silent, and get thee into darkness, O daughter of the Chaldeans: for thou shalt no more be called, The lady of kingdoms.
People have been writing about weaponized EMP for at least a decade. This topic is growing in awareness among an increasing number of educated persons. The big book here is One Second After (2009) by William R. Forstchen. There is also GoldenEye the 1995 film that foreshadowed EMP and some of the plausible science of grid down terrors.
Congress, Pentagon, and national security agencies have known of this scenario for at least one decade. Over the same decade, almost nothing was done to harden the grid or provide for real civil defense. Multibillions and trillions were spent on Federal Reserve interest, bank bailouts, foreign wars, and healthcare industry bailouts.
One Second After opens with a quote from Robert Oppenheimer, a successful nuclear scientist, who quoted from the ancient Hindu text of Bhagavad Gita and said "Now I am become Death, the destroyer of worlds." 
I would've used a different line of actual Scripture for my opening statement. That verse appears at the top of this page. However my direct response (from within scripture) to the author's choice of opening statement is this: Mark 12:27 He is not the God of the dead, but the God of the living: ye therefore do greatly err.
I would follow up with Revelation 1:18 I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.
"Russia and China have advanced EMP weapons capability but they are rational nations. They are not cultish nations led by deranged tyrants claiming to possess divine authority. If Russia or China launched an EMP attack on America, it would occur in the first phase of all out war." Don Koenig 
I agree; the rational actor model from poli sci applies. It breaks down as said with respect to deranged religious leaders such Obama, Cruz, jihadists, Iran and North Korean leaders.
A essay topic question with that piece I cited is, how likely does one think it is that this is America's final decade as a superpower? I reason that the answer is very likely. Even a 70% chance of screwed means there is still some chance and it may not happen.
Part of the mystery is that God is omnitemporal and sovereign over time and the creation, that is a long story and it is why Earth has not been destroyed over supposed 4 billions of years (science falsely so called per 1 Timothy 6:20). Earth survival topic also leads into proofs for God's omnibenevolence.