You need to slightly modify your post. There are different types of terrorism, such as religious terrorism, drug-related terrorism, communist terror.etc. There are non-Muslims involved in some types of terror, such as the NDFP / NPA of the Philippines. But 99% of the terrorism motivated by religion are committed by Muslims.
I don't think its appropriate to say when it comes to the word TERRORISM we will accuse the muslims,well this is right to be accurate and specify what kind of terrorism we are describing or saying,I've heard many terrorist that are not muslims too.rebellion starts when an opinion/idea or law is not accepted by one or both parties.So they will start a movement to promote their ideas and feelings and due to their belief that actions speaks louder than words.Some issues also includes money related problems.If not settled with an agreement or peace talk it ends to a war.
Tell me whom you lately saw terrorists are not Muslims? I have not seen such. Since the Olympic games in Munich terrorist attacks committed only by Muslims. Moreover all the attacks they commit, shouting in the name of Allah. For me it means that Islam is equal to terror.