Christians in Egypt seem to have often had problems with violence against them.
Christianity in Egypt - Wikipedia
How do we stop ISIL or ISIS? My guess is go after their leaders. Cut off the heads and hope three more do not grow back. Fight their propaganda with the truth about how these groups destroy lives and take the human rights away from so many. Give minorities opportunities in the cities-- like the Somalians in the Twin Cities-- so that they are not attracted to radical Islam zealots on the Internet.