All terrorist organizations consist of Sunni Muslims, who don't follow the right path of the religion. The Prophet NEVER taught violence.

Shia's on the other hand, are peace loving people and the Dawoodi Bohra community (sub-sect) being the most official (has an official spiritual leader) and organized among them.

Bottomline: Islam doesn't teach terrorism/violence and Terrorists are NOT Muslims (from the moment they violate the religious laws).

Peace.