My answer is FEW MUSLIMS ARE TERRORISTS BUT THERE ARE TERROR GROUPS FROM OTHER REGIONS AS WELL. Its just the media that highlights acts of terror being committed by Muslims and those by non Muslims are ignored in entirety. Some of the non Muslim terror groups are as under:

1.  Aum Shinrikyo:  Founded by Japanese dooms day cult and comprising of elements from Hinduism and Buddhism.
2.  Liberation Tigers of Tamil Eelam: Founded in 1970 to fight for separate homeland for Tamil minority of Sri Lanka.
3.  National Liberation Army Columbia:  Leftist Guerrilla group that advocates for establishment of Christian communist regime.
4.  Shining Path: Guerrilla Rebel Organisation founded in 1970 by Guzman (a philosophy teacher) who wanted to replace Bourgeois Democracy.
5.  Revolutionary Struggle:  Greek group founded in 2003 and was notorious for its attacks on Greek government buildings and US Embassy in Athens.

The above mentioned organisations are just a few, while the list continues to grow longer.