Christians have 10 commandments that were made by Moses. No one can kill another. I am guessing this is why there is no terrorist group which is depicted by christian doctrine.
These commandement are not Christian. Is is Jewish. Moses is not Christian.
Though the root of Christianity, Catholicity, and Islam is based on Jews.
I would say the conflict and terrorism are not because of the religions. In both Christianity and Muslim Quran, violence and killing are condemned.
I guess bad people only using religion to cover up their mistakes.