Don't get wrapped up in the paranoia. It's not worth it. Revelation is meant to give people hope--not put them in despair!
Revelation is there to give hope to those who were going to die for Christ any ways. I'm not sure I'd call it a book of hope outside of those who theorize that there is a rapture before any of it goes down.
Revelation is not a book of comfort, but it's a book about ultimate triumph. The argument either goes it's never going to happen because it already did (amilinellism) or it's going to happen at some point in the future (with lots of sub arguments about what exactly happens and when).
Eschatology is an important and often overlooked subject within the church - the trouble is it needs to be done without lies or fearmongering, and with the understanding that anyone setting dates is going to be wrong since not even Christ knows the day or the hour.
Case in point, the bible DOES talk about thirds of the population dying, but not necessarily due to a nuclear attack.
Rev 8:
7The first sounded, and there came hail and fire, mixed with blood, and they were thrown to the earth; and a third of the earth was burned up, and a third of the trees were burned up, and all the green grass was burned up.
8The second angel sounded, and
something like a great mountain burning with fire was thrown into the sea; and a third of the sea became blood,
9and a third of the creatures which were in the sea and had life, died; and a third of the ships were destroyed.
10The third angel sounded, and a great star fell from heaven, burning like a torch, and it fell on a third of the rivers and on the springs of waters.
11The name of the star is called Wormwood; and a third of the waters became wormwood, and many men died from the waters, because they were made bitter.
