". . .and 1190 to 1250, which was marked by Muslim armed resistance, the setting up of a rebel polity under the last Muslim leader of Sicily, and Frederick II’s ‘extermination’ of Islam."
It might be true of the first third and to a lesser extent the second, but that and this:
"An unfree and subjected population, Sicilian Muslims depended on the mercy of their masters and, ultimately,on royal protection. When this was removed, hell broke loose. King William’s death in 1189 opened the way for widespread attacks against the island’s Muslims. The author
of the Epistola ad Petrum remarked that “it would be difficult for the Christian population not to oppress the Muslims in a crisis as great as this, with fear of the king removed”
and predicted that Muslims would respond by occupying mountain strongholds
8"
do not suggest a more peaceful transition than say, Granada.
http://www.academia.edu/294825/Cont...d_Christians_in_the_Unmaking_of_Norman_Sicily
Also, this is an interesting read on the general subject of dealing with Muslim subjects:
http://www.cliohworld.net/onlread/5/29.pdf