Terrorism is so easily thrown around as a blanket term these days. As many others have pointed out, the motivation seems to be more separatist than religious.
Separatist movements fit well with a traditional definition of terrorism, though (something like "politically motivated violence by non-state entities", maybe confined to violence against civilians). Purely religious terrorism was the exception until recently.
Separatism and terrorism are orthogonal. There are separatist movements that resort to murder, but there are also separatist movements that campaign peacefully.
Terrorism has a meaningless definition. It's as meaningless as 'communism' was during the Cold War; or 'socialism' in American politics.