Terrorism and islam have become synonyms of each other but is it a recent phenomenon or hast it always been this way. Let us take a look at a couple of verses from Quran.008.002
YUSUFALI: For, Believers are those who, when Allah is mentioned, feel a tremor in their hearts, and when they hear His signs rehearsed, find their faith strengthened, and put (all) their trust in their Lord;
PICKTHAL: They only are the (true) believers whose hearts feel fear when Allah is mentioned, and when His revelations are recited unto them they increase their faith, and who trust in their Lord;
SHAKIR: Those only are believers whose hearts become full of fear when Allah is mentioned, and when His communications are recited to them they increase them in faith, and in their Lord do they trust.008.012
YUSUFALI: Remember thy Lord inspired the angels (with the message): "I am with you: give firmness to the Believers: I will instil terror into the hearts of the Unbelievers: smite ye above their necks and smite all their finger-tips off them."
PICKTHAL: When thy Lord inspired the angels, (saying): I am with you. So make those who believe stand firm. I will throw fear into the hearts of those who disbelieve. Then smite the necks and smite of them each finger.
SHAKIR: When your Lord revealed to the angels: I am with you, therefore make firm those who believe. I will cast terror into the hearts of those who disbelieve. Therefore strike off their heads and strike off every fingertip of them.
Now if you look at these two verses, it becomes clear that Allah strikes terror not only in unbelievers but also into believers. Why would the most merciful, most wise god need to do that unless that god is paranoid and wants to control his followers using terror. In a religion in which believers are supposed to tremble on hearing God's name tells a lot about the religion. I am not sure how many other religions have Gods whose mere mention should strike terror in their hearts?