Muslim rulers
Islamic Group in Kurdistan was created in 2001.
No conflicts between Islamic group. So, it is nonsense to say which group is the strongest.
It depends on the Islamic Empire in question. Assuming that you are talking about the Abbassid Caliphate (which is most commonly referred to as "the Islamic Empire"), the group that brought them down was the MONGOLS.
Islamic
Shiite
Abbasid.
the Qajar shahs
An Islamic Religious Brotherhood.
Shia
Islam Religion is not a religious group. Its a religion for whole universe. Its not for a specific group.
Islamic Aid is an Islamic charity that primarily works in poverty relief in Islamic Countries. To read more about the group, please see their website in the Related Links below.
Taliban