That paragraph is so ignorant. A couple of additional logical failures:
Under those conditions, even skeptics would likely feel compelled too admit bible prophecy was undergoing fulfillment.
No, those conditions are things that have always happened. Think back to early man in the ice age. It would just be considered by skeptics to be the cycle of life.
From the simplified version.
But if that happened, it would be obvious to everyone that Bible prophecy was being fulfilled. It would be clear even to people who are not interested in what the Bible says.
No, most of the world does not follow they Bible. Bad conditions would lead them to their own religion for answers. As an example, I was speaking to a Muslim once, who was saying earthquakes were a sign of Allah's return. He would not see it as a sign to join Jehovah's Witnesses.