Mudug-Madman
Gaalkacyo Gangster
ISIS makes haram acts halal. They are kuffar. In fact they're the worst type of kuffar because they pretend to be Muslim, and exclusively prey on Muslims. This man went over there to join their group and participate in that bullshit, so he's a kuffar as well.Then you are a Khariji because only they make takfeer based on crimes/sins.
Ahlu Sunna Wal Jama only makes takfeer based on Major Shirk and Major Kufr and even in those circumstances there are certain exceptions.