He’s a Nazi. They used Christian words and symbols occasionally, too, because they were useful.
His agenda was ethnic and ideological cleansing through violence. The closest historical parallel we have, if we’re in search of a label, is “Nazi”.
The worst fit, on the other hand, would be “Christian”.
“As atheists and antitheists, we need to be quick in spreading the word about the fact that although he defines himself quite clearly as “non-religious”, he is charged by god on this mission. He is anti-catholic, anti-protestant, anti-evangelical and basically anti-all world religions because they are all so corrupt and far away from the origins of what Christianity is all about, patriarchal. The true heros of Christianity being, of course, people like Richard the Lion Heart, who completed “defensive” crusades in god’s name. This will be another point that religious zealots will use, much like they do Hitler and Stalin, to point out how “evil” we are. Religiots.”
http://www.thebritishatheist.com/2011/07/anders-behring-breivik-2083-european.html
I found this on a British Atheist’s site and would like to know where he got the information. I also saw it in a comment in the Huffpo. They’re desperate to hide it.