Sorry, but this smacks of a 'round up the usual suspects' cover-up by the authorities.
I have it from a Copt who attends our Eastern Orthodox (Rum, that is, for folks in the know about Christianity in the Middle East) mission when he doesn't make the 2.5 hour trek to the nearest Coptic church, that the Coptic community in NJ know who the killers are. Evidently the Armanious family were instrumental in the conversion of an Egyptian woman from Islam to Christianity, and shortly after the murders all of her still-Muslim relatives returned to Egypt.
The lack of forced entry was because the killers convinced the Armanious's that they were interested in a Bible study, and were welcomed into the home.
But one of them was using the dead father's ATM card.
Look, the King family is convinced Martin Luther King was killed by a giant conspiracy going to the top of the US Government, not by a lone dumb redneck.
People from the Coptic community were shocked and horrified by this crime and they drew some comfort from the idea they were religious martyrs, which is still based on very thin evidence. It doesn't make them right.