I just noticed and realized that I have never heard of a certain Christian terrorist, all I hear is that when a terrorist is in the news, he/she is a Muslim. I am not saying that Muslims are terrorist, so don't get me wrong.
Muslims are entirely different from Islamic terrorists. Their ideology is to kill everyone who is different from them and their religious fanatical notion of restoring moral order on earth by killing maximum people because Quran/god said so is pure madness. Quran has nothing to do with these terrorists, they have just twisted and distorted it to fulfill their kill for thrill/chaos.
Islamic terrorism is an organized network. They readily have access to convince innocent children that terrorism is the way of God and recruiting them to do heinous crimes.
And because of these few lunatics, millions of Muslims are labelled terrorists. Media is responsible for portraying Muslims as terrorists because they put no effort on covering non-Muslim related terrorism, but amplify their coverage when a Muslim is involved. Islamic terrorism has increased since 9/11, but before that if you look at the stats majority of terror attacks were committed by non-Muslims.

What has happened in the world is crime is perpetrated. If it is perpetrated by anyone who is not a Muslim, its called a crime. And if its perpetrated by a Muslim, its called terrorism.
http://aboutislam.net/counseling/ask-about-islam/why-are-most-terrorists-muslims/