Hitler didn't killed anyone for his religion. He was a Catholic, but he was only slightly religious. He was more concerned with race. He did't quoted any verse from the bible when he was killing the Slavs, Jews and the Roma. Breivik was non religious, although he was born to Christian parents. He was also more concerned with race.
And the vast majority of the victims of Hitler and Breivik were Christian.
Nazism was a racial ideology, which propagated the belief that the German/Nordic race was superior to the Slavic/Balkan races. The aim of the Nazis was to clear the European continent of non-Germanic people (Slavs, Roma, Jews.etc), and to free up the land for German colonization.
The Islamic ideology is different. The race never plays a tole here. Islamic sects want to free up the land, by murdering, and enslaving the native infidel population and making the regions available for Islamic colonization.