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.
No mate, its not about religion. Its true that most of the terrorists are from Muslim background as some of their self proclaimed leaders are trying to spread hatred against rest of the religions. They brainwash poor and illiterate youth and ask them to carry terror activities in the name of Islam. I have many muslim friends and believe me they are very humble, friendly and peaceful people.
You started off and said it's not about religion, then proceeded to show that it was all about religion.
23% of the world's population is Muslim, and over 95% of terrorists are Muslim.
As far as "radical extremist religious terror," Islam owns it, mate.