I think if a group is going to claim to be a representative of a particular religion, its religious positions do need to bear some resemblance to the positions that were apparently set out by the prophets/god/gods that are recognised to belong to that religion. But to be classified as religious in a general sense, religious positions alone count as sufficient qualification.
The problem comes from the definition of innocent.
As you know, the Quran details the killings and executions of thousands of people under Muhammad's conquests. Men, women and children. These killings are legitimised by the Quran as punishment for the guilty, but often a person was deemed 'guilty' for merely refusing to declare allegiance to Muhammad, or for crimes such as blasphemy.