Earlier quoted context omitted.
A B Breivik at least claimed not to be a personal believer in Christianity. Also his notes leave little doubt that he didn't practice Christianity. And he sure isn't a Muslim.
He doesnt identify as atheist per se and his statements on religion are ambiguous. He says, for example, that he prayed to God during attack. http://en.wikipedia.org/wiki/Anders_Behring_Breivik
Thanks.