Out of curiousity, why does it matter?  If this guy isn't Muslim, does that make him LESS of a terrorist? People can change religions any time they want.  Some of the people who left North America to join ISIS weren't born into Muslim families.  They were talked into committing violent acts.  Becoming Muslim was simply an excuse to justify a desire to kill.

I don't understand why killing 5 people is less evil an act if the perpetrator is Christian.  Do you think it matters to the people who died?