You don’t believe terrorism would exist if there was no Islam? Is everything religious to you?
I know that the profound majority of terrorist acts trace back to radical religious fanatics. In this Century it has been Islamic fanatics. Name a Christian terrorist in the last 30 years.
The opposite of good is evil. It’s basic physic’s, when a first body exerts a force F1 on a second body, the second body simultaneously exerts a force F2 = −F1 on the first body. IOW for each “force” their is an equal and opposite “force”. Ascribing labels is a function of ones frame of reference.