"The plight of Christians, Yezidis and other religious and ethnic communities that are numeric minorities in Iraq demands a clear and courageous stance on the part of religious leaders, especially Muslims, those engaged in interfaith dialogue and everyone of goodwill," said a statement from the Pontifical Council for Interreligious Dialogue released by the Vatican Aug. 12.

"All must be unanimous in condemning unequivocally these crimes and must denounce the invocation of religion to justify them," the statement said. "Otherwise, what credibility will religions, their followers and their leaders have? What credibility would remain to the interreligious dialogue patiently pursued in recent years?"

The document noted that the "majority of Muslim religious and political institutions" have opposed the Islamic State's avowed mission of restoring a caliphate, a sovereign Muslim state under Islamic law, to succeed the Ottoman Caliphate abolished after the founding of modern Turkey in 1923.

The Vatican listed some of the "shameful practices" recently committed by the "jihadists" of the Islamic State. Among the practices cited:

-- "The execrable practice of beheading, crucifixion and hanging of corpses in public places."
-- "The choice imposed on Christians and Yezidis between conversion to Islam, payment of tribute or exodus."
-- "The abduction of girls and women belonging to the Yezidi and Christian communities as war booty."
-- "The imposition of the barbaric practice of infibulation," or female genital mutilation.

"No cause can justify such barbarity and certainly not a religion," the document said.

"Religious leaders also are called on to exercise their influence with the rulers for the cessation of these crimes, the punishment of those who commit them and the restoration of the rule of law throughout the country, ensuring the return home of the deported," the Vatican said. "These same leaders should not fail to emphasize that the support, financing and arming of terrorism is morally reprehensible."