Well, in my country there were 2 terrorist acts since 50s, both by young political extremists. One by right-wing Catholic (well, I'm not sure he's Catholic, but I'm sure he's not Muslim), and the other by 2 most probably atheistic left-wing extremists.

And Poles had a lot experience with political terrorism when we were under occupation. Even our 1920s-30s leader Piłsudski was a terrorist once.

So yes, terrorism isn't about religion, it's just correlated with one (and not even that strongly, usually - the current wave of terrorism doesn't even have the highest victim count in the last 50 years in Europe).