I'm not sure what part Muslim terror has in God's plan.
When we look in the book of Daniel, we see a move of spiritual principalities: The principality of Persia that had been ruling over the area we now call the Levant got up and moved back to the east while the principality of Greece moved eastward to begin ruling over the Levant. In the meantime, the principality that had been protecting the people of Israel continued his covering role right where he was. In the spiritual realm, one principality moved away, another moved in...like the change of shift workers or a changing of the guard.
In the material realm of men, however, there was human nation against human nation: Chaos, war, and death.
When the Soviet Union fell, I and some other Christians in the intelligence community watched the details intently. This was a sudden and complete surprise. US military attaches in Soviet Bloc nations reported Soviet troops hurriedly throwing their gear into trucks and rushing back to Russia in chaos, as though they were fleeing an unseen invader. We watched military units in the Soviet Union--active every day in grim determination for half a century--suddenly fall apart. The Russian cosmonauts in the Mir space station were frantic because the Russians scientists at Baikonur Cosmodrome (their version of the Kennedy Space Center) had simply stopped going to work, and the cosmonauts actually were afraid nobody would bring them back. Sudden chaos out of nowhere.
Since then, Russia has been merely a place where bad men were doing bad things and good men were doing good things--the ordinary simmering chaos common in the fallen world...not the directed, stolid activity of controlled evil that had been the Soviet Union.
We watched that happening, and in our Pentagon bible studies we wondered to each other: Had we just witnessed the movement of a principality? Had a spiritual authority that had governed the Soviet Union simply get up and move somewhere else? And if so...where? And why? What plan was in motion?
I don't pretend to know the answers to those questions, but I look at these kinds of broad activities and wonder what is behind them in the spiritual realm. But certainly, we see something new happening. There has been a slow simmer of Islamic terrorism since the 70s--most people had the luxury of hardly noticing, but it had been my professional business to study it since the mid-70s. That was aimless stuff, going back and forth, rising and falling, without a goal.
There is something broad and new going on. This is not just the activities of evil men--evil men alone don't act in such concert around the world, but at the urging of demons that are anywhere and everywhere whispering the same suggestions into open ears all around the world, any open ear that prayerfully welcomes them.
This is not going to be brought to an end by trusting in chariots and horses.