And this is one of the sources of the war. Imams have the authority to field their own combat units. Care to give that ability to Catholic leaders? That ended centuries ago, unless you consider Islam.
This is only one of a number of issues at the heart of the war(s). It only takes one or two good ones, like slavery and the U.S. Civil War. I have identified more than 6 concerning Islamic law and government. No wonder we are seeing organized violence in those areas of the world where Islam is in contact with other governments and cultures.