There are many many terrorists in this world who are not Muslim. Think IRA atrocities, think right wing American extremists such as the Oklahoma Bomber Mc Veigh, Animal Rights extremists, Anti Abortionists etc. If you want I can give you an extensive list of non muslim terrorist organizations.

Terrorism is an evil which is used by all extremists of every religion and race. It is not just the domain of muslims although the western media and the US government would like us to believe it is.