From this article comes the question: what is meant by terrorists. There are two versions of the answer. Because in this world there are only two categories of people, Muslims and non-Muslim, and both understand truths of the Creator, even if the entire human race puts them at fault. So the only important thing is where we stand on the definition of terrorism. On the side of of Islam/non-Islam, heaven/hell, regardless of their religion. It may be that religion is nothing but a facade, and the teachings are not heeded. What is the meaning in that? So, find the right religion.