From the Middle East Forum:
While it is easy to confuse the recent jihadi attack on Egypt’s St. Mark Cathedral in Cairo as just more of the usual, this attack has great symbolic significance, and in many ways bodes great evil for Egypt’s millions of Christians.
Consider some facts: St. Mark Cathedral—named after the author of the Gospel of the same name who brought Christianity to Egypt some 600 years before Amr bin al-As brought Islam by the sword—is not simply “just another” Coptic church to be attacked and/or set aflame by a Muslim mob (see my forthcoming book, Crucified Again: Exposing Islam’s New War on Christians, for a comprehensive idea of past and present Muslim attacks on Coptic churches). Instead, it is considered the most sacred building for millions of Christians around the world—above and beyond the many millions of Copts in and out of Egypt. As the only apostolic see in the entire continent of Africa, its significance and evangelizing mission extends to the whole continent, including nations such as Sudan, Ethiopia, Libya, Tunisia, Morocco, and Algeria, to name just a few. As an apostolic see—the actual seat of an apostle of Christ—the cathedral further possesses historical significance for Christianity in general.
In short, Muslim mobs—aided and abetted by the state of Egypt under Muslim Brotherhood tutelage—did not merely attack yet one more Coptic church, but rather committed an act of war against all Christianity. Such an open attack on a Christian center which holds symbolic and historic significance for all Christians—St. Mark, whose relics are in the cathedral and who authored one of the four Gospels of the Bible, belongs to all Christians not just Copts—was an open attack on a universally acknowledged Christian shrine. It was precisely these sorts of attacks on Eastern and Orthodox churches—including the destruction of the Church of the Resurrection in Jerusalem in 1009—that presaged the way for the crusades (back when Christianity was not utterly fragmented and disunited as it is today).