Islamists have been assaulting Coptic Christians since the 2011 revolution that overthrew the autocratic Hosni Mubarak, but the attacks have intensified since the ouster of Mr. Morsi, the country’s first democratically elected leader.

Islamist mobs have torched schools and businesses owned by Christians, looted churches and even paraded captive nuns through the streets of a city south of Cairo in a display of rage unseen in Egypt’s recent history.

The campaign of killing and arson is retaliation for the tiny Christian community’s support of the military coup that ousted President Mohammed Morsi and his Muslim Brotherhood government.

“The Muslim Brotherhood were the ones who called for aggression [against Christians]. They are responsible,” said the Rev. Khalil Fawzi, a pastor at Kasr El Dubarrah Evangelical Church, the largest evangelical congregation in the Middle East. “Either they are in control or they burn Egypt.”

Since the military removed Mr. Morsi seven weeks ago, his supporters have burned at least 44 churches and ransacked more than 20 other Christian institutions throughout Egypt.

Most of the attacks were in regions south of Cairo. In the capital, police and neighborhood watch groups protected many churches and Christian-owned shops.

At least six Christians and one Muslim working at a Christian-owned shop have been killed since Mr. Morsi was removed July 3, human rights activists said. Nearly 900 people in all have died in clashes between security forces and Morsi supporters.

Coptic Christians make up about 9 percent of Egypt’s population of 85 million, and other Christian denominations about 1 percent. The vast majority of Egyptians are Sunni Muslims.

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