I won't use the term ISIS - that reflects an aspect of an Egyptian netjeru.
I'd use IS.
Whether their victims are Christian, Islam, American, Syrian, Tunisian, British or whatever matters not a jot.
Each and every one was human.
FYI I knew one of the victims shot by the IS gunman in Tunisia quite well - I first met Jim McQuire at a BB training course in 1980, and we remained in touch for nany years - exchanging cards and phone calls as late as last Christmas.
He was an innocent victim of a murderer.
A murderer who was one of a tiny minority of a sub sect of a sect of Islam.
The Church of which he, and his wife, were members - committed believers - has held prayer vigils to pray for the family of the murderer, and for all those radicalised to kill, whether in the middle East or wherever.
I do not hate IS - and let me tell you, niether does Jim's son.
Hurt, heartbroken though he is, he has forgiven the murderer.
The rest is up to God.