Before Israel fought Hamas, they been fighting the PLO(Palestine Liberation Organization) for decades, the founding members and rank and file of the PLO have been Palestinian Christians. So you can't say it's Islamic, when Palestinian Christians where in the front. You don't think all Arabs are Muslims, do you?
Look up the three men below in the photo, they can be seen with Yassir Arafat in the photo, they are Palestinian Christians and they been riding for Palestinian liberation since the beginning. Most of them are in exile because Israel accused them of hijacking planes, massacres and other shyt. So it is not about religion, more of Palestinian nationalism.
Nayef Hawatmeh
Kamal Nasser
George Habash