Fanaticism is a description of the level of zealotry found in followers/members of any group, not just Fascism and its clones.
Actually, Hannah Arendt documented one of the truths of Fascism ~ it was not only evil, it was banal in its evil. She's the person who came up with the term "the banality of evil".
The term "fanaticism" implies something far different.
I am not sure what the point is in claiming that there is no difference between Shia and Sunni ~ that would be like claiming there is no difference between the Roman Catholic church and the Apostolic Charismatic Free Will Seventh Day Baptist church on the corner.
Over the years muawiyah, we have come to expect you not to see the point. If you can't see that there is no difference between Zaqawi and Sadar, then all the posts in the world will do nothing more than allow you to continue to nit pick until the points are entirely lost and you have hijacked yet another thread.