Anders Behring Breivik has no coherent ideology. Instead he appears to have picked bits of numerous rightwing philosophical strands and attempted to weave them together and present them as his own.
Breivik comes from a culturally conservative Christian background, and this has shaped much of his political outlook. Into this he has incorporated more traditional nationalist and racist ideologies and adopted the politics and language of the “counter-Jihad” movement which believes Islam is a major threat to western civilisation.
Immigration and multiculturalism are seen as the Trojan horses through which Islam is gaining a foothold in the west, and in targeting government buildings and the youth wing of Norway‘s ruling Labour Party he was attacking those who he blamed for the rise of Islam.