No I don't. There are many terrorist organizations across the world are not Muslims. Although majority are Muslim outfits. Some examples of the terrorist outfits which are not Muslims are:-
1. LTTE active in Sri Lanka and have covert operations in India 2. Babbar Khalsa International this organization is thought to be gone, but some recent activities showed their resurgence as blasts in a theater hall in Ludhiyana, also the main accused of Kanishka tragedy hailed as martyr in Canada. 3. Terrorist outfits in NE states. 4. Naxals in the middle India, like Chhatisgarh, AP etc., though they are not branded as terrorist per se but their activities are similar.
