Terrorists have NO religion. And we should not let them claim one.
The religion/philosophy of the terrorist is that violence is the solution.
Terrorists have no claim to any other religion or philosophy.
Violence, particularly violence to innocents, is wrong.
Throughout history people of violence have justified their actions by using religion. This also provides them with gullible recruits. The media can and should disallow these people from using this ruse. Reporting that a terrorist claims to be of some particular religion is participating in propaganda.