Recovering -
According to the FBI, 94 percent of terrorist attacks in the United States since 1980 were perpetrated by non-Muslims.
Yes, all religious extremism is dangerous.
If this figure were true and it is not, there would still be something we could learn from it - musilims (1% of population) committed 6% of the terrorist acts. They are six times more likely to commit acts of terror, case closed.
Lets look at another set of statistics, this time from wikapedia, https://en.wikipedia.org/wiki/Terrorism_in_the_United_States cases of terrorism in the US 1980 - current.
I counted 108 acts that caused death or injury, 44 of them by muslims, that is 37%
The important thing to take away from this is that there are some Christians that commit acts of terror despite the teaching of their leader however muslims commit acts of terror because of the teachings of their leader.