The Basic and simple definition of terrorism is: Terrorism is an activity which causes terror, and the person who causes this activity is called terrorist. The moment a robber sees a policeman he is terrified. So a policeman is a terrorist for the robber. In this context every Muslim should be a terrorist.
When a criminal sees the Muslim he should be terrified, Whenever any rapists sees the Muslim he should be terrified, Whenever any robber sees the Muslim he should be terrified, Whenever any antisocial element sees the Muslim he should be terrified. That's what the Quran says in Surah Al-Anfall Ch. 8 V 60 "Cause terror in the heart of anti-social elements". Those people who are killing around people and who are against humanity Quran say cause terror in their hearts.
Whereas the word "Islam" itself means "Peace", whose fundamentals teach its followers to maintain and promote peace throughout the world. Anyone, be it Muslim or non-Muslim, who kills an innocent Muslim or a non-Muslim, kills the entire humanity. However, Islam goes a step further to say that if one saves innocent lives, the whole of humanity is saved.
Thus every Muslim should be a fundamentalist i.e. he should follow the fundamentals of the Religion of Peace Islam. He should be a terrorist only towards the antisocial elements in order to promote peace and justice in the society.
Historic records proved that a large number of terrorist acts in the 20th and 21st century were committed by non-Muslims. And when we analyze we can surely say without any doubt that terrorism is not a Muslim monopoly. Not only is Terrorism not a Muslim monopoly, it is not even a specialty of the Muslims. It is not even encouraged in Islam. It is prohibited...
"If any one slew a person - unless it be for murder or for spreading mischief in the land - it would be as if he slew the whole people: and if any one saved a life, it would be as if he saved the life of the whole people." -