you're giving Islam way too much credit.
It's a backwards outdated primitive religion, but it still offers guidance for strong family unity and the
surrender-of-self so that's why it's not died out yet. It's not unified in purpose in any meaningful global way. And it doesn't attack or invade lands it considers
other. This is why it's considered
the religion of peace.
The threats from Islamic terrorism are the birthchild of American/Isreali (and before that Soviet, and before that British) foreign policy.
Thought Experiment:
You are an Afghani villager, a reasonably uneducated and religious family man. How would you feel when bombs rain down on your village, killing your family? There's not much you can do, for even if you did manage to shoot down one of those drones, it would come down unmanned anyway. That's hardly hurting the aggressor, that's not gonna make him stop. You see powerfully-armed foreign men dressed in military wander in the village sometimes, asking questions about people you used to know. Sometimes they repair roads and bridges and appear quite friendly. You're quite sure they're related to the bombs that drop, but they never say it openly, and neither do you. You don't trust them, that's for sure. You've heard about a Freedom Fighter Training Camp, and heard this may help you fight back and avenge the deaths of your fallen.
...a while later...
Now you are so mighty you are feared by the most advanced military the world has ever seen. You scare over 300 million people who don't even know your story. Even the President of this mighty superpower talks about you in serious hushed tones, fearing your wrath.
That's how mighty you have become. Mohammad would be very proud. You've done good work, one step closer to stopping the bombs and the foreign military men. You praise Allah.
Question:
Who is responsible for giving this inconsequential poor man so much power?
and why?
The answer is the same reason why vague threats from a 1500-year old book are being amplified to create even more fear. It has nothing to do with Islam and everything to do with
The Power Of Nightmares.