The Muslim historians will have you believe that the Coptic Christians actually welcomed the Muslims because they were being persecuted by the Byzantine Empire which was trying to force everyone into total unity of faith. The passage below was taken from the coptic.net web site and reveals just what happened at that time and afterwards. It also reveals that the Muslims were not so "civilized" as they like to brag about, claiming they had a greatly advanced civilization full of knowledge while Europe was in the Dark Ages. You will see just how advanced---

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Christianity in Egypt:
The bible tells us the story of the flight of the holy family to Egypt from Herod. The holy family sojourn in Egypt included several places in both northern and southern Egypt. Saint Mark the Evangelist introduced Christianity into Egypt. He was martyred at Alexandria, Egypt. Saint Mark is the first leader of the Coptic Orthodox Church, and was followed by his first convert in Alexandria, Annianus circa 62 A.D. An unbroken succession of leaders for the Coptic Orthodox Church starts with Saint Mark and continues to the present Pope Shenouda III. He is the 117th successor of Saint Mark. ...

The Arabic and Turkic Eras:
The wars between the East-Roman Empire and The Persian Empire in the 6th and 7th centuries weakened both empires. The Muslim Arabs attacked both empires in the 7th century. After their conquest of the East-Roman provinces of Jordan, Syria, Lebanon, and Israel, they invaded Egypt in December 641 A.D. Egypt was one of the precious crown jewels of the East-Roman Empire. It was the breadbasket of Rome first then Constantinople. It was a fertile land that produced and exported wheat, corn, wine, oil, textiles, glass, cosmetics, and medicinal and chemical products of the time. ...

The destruction of the Library of Alexandria:
Scholars differed in views on how the ancient library of Alexandria was destroyed. However, recent research by Luciano Canfora concluded that the Arab general Amer ibin Alass at the orders of the Arab Caliph Omar ibin Alkhatab did the destruction of the library. The story of the Arabs destruction of the library indicates that it took them six months to burn the books in about one thousand public bathes in Alexandria....

Arab and Turkic Dynasties, 640-1798 A.D.:
Several Muslim Arab and Turkic dynasties ruled Egypt from 640 A.D. to 1798 A.D. ...

After the Arabs conquest 641 A.D., the start of their rule was relatively mild. The Arab rulers primary interest was in exacting the maximum financial gain out of the rich land of Egypt. John of Nikiu in his chronicles indicates that Amer ibin Alass, after the conquest of Egypt, "increased the taxes to the extent of 22 batr of gold till all the people hid themselves owing to the greatness of the tribulation, and could not find the wherewithal to pay." The Ommyiads followed by the other dynasties instituted heavy taxes including poll tax or Algyzya, tribute and different exactions. At times the Arab rulers found it convenient to throw prominent Copts, e.g. a Bishop or Pope, in jail and request ransom to release them. The Umayyad Caliph Suliman ibin abed Almalek reflected this policy, in writing his appointed ruler of Egypt "to milk the camel until it gives no more milk, and until it milks blood". Though some of the Arab rulers were moderate, most were oppressive, cruel and committed a lot of atrocities against the Coptic population. The ultimate policy of the Muslim Arab rulers changed gradually from maximum financial gain to Isalmization either through incentives of reduced taxation, or by outright violence and force. Arab and Turkic rulers from different dynasties continued to levy heavy taxation to impoverish the Copts, instituted policies to eradicate the Coptic culture, language, leadership, and initiated violence and pogroms against the Coptic population.

Assault on Coptic Language, Culture, and Monuments:
The assault on culture that was initiated by the destruction of the Alexandria library continued by the Umayyads who decreed the use the Arabic language instead of Coptic in the governance of Egypt. It took centuries for Arabic to replace Coptic as the spoken language of the land. The Coptic language continued in general use until the 13th century.

Unlike the Greek or Roman rulers who maintained and rebuilt some of the ancient Egyptian temples, several Islamic rulers destroyed and pillaged the ancient Egyptian temples and Churches. The marble and porphyry pillars obtained by the destruction of many ancient temples and churches were used to build palaces, mosques, and at times just left a trail of destruction. Sultan El Aziz attempted to destroy the great pyramids of Giza circa 1193 A.D. He gathered a large labor force that attempted to destroy the pyramids for eight months. At the end of which, they succeeded in only destroying a part of the casing of the pyramid and made a small breach in one side. Fortunately the great effort needed convinced El Aziz to abandon the destruction of the pyramids.

Resistance for Oppression:
The Arab's oppression led the Copts to several rebellions, but these rebellions failed to break the yoke of oppression or achieve independence. The Copts in the eastern Delta fought against the Ommayyds oppression in 725 A.D. A large-scale Coptic revolt against the Abbasids took place circa 815 A.D. El Maamoun, the Abbasid Caliph, had to bring in a large army with elephants to conquer the Copts revolution of 815 A.D. Even as late as 1176 A.D. the Copts of the city of Koptos revolted against the oppression of the Turkic rulers. The policy of heavy taxation, pillage, and violence was also accompanied by forced migration of Copts to other parts of the Islamic Empire, and settlement of Muslim Arabs into Egypt. As a result, many of the Copts were forced into Islam to escape the continued oppression and heavy taxation. The forced Isalmization policy was followed by most of the Arab rulers, and later on also by most of the Mamluks and Turkic rulers. Gradually, the population of Muslims increased and the Copts decreased. The population of the Copts decreased from 9 million at the time of the Arabs conquest 641 A. D. to approximately 700,000 at the early 1900's.... (http://www.copts.net/history.asp)

Here is more history taken from another coptic web site:

For the four centuries that followed the Arab's conquest of Egypt, the Coptic Church generally flourished and Egypt remained basically Christian. This is due to a large extent to the fortunate position that the Copts enjoyed, for the Prophet of Islam, who had an Egyptian wife (the only one of his wives to bear a child), preached especial kindness towards Copts: "When you conquer Egypt, be kind to the Copts for they are your proteges and kith and kin".

Copts, thus, were allowed to freely practice their religion and were to a large degree autonomous, provided they continued to pay a special tax, called "Gezya", that qualifies them as "Ahl Zemma" proteges (protected). Individuals who cannot afford to pay this tax were faced with the choice of either converting to Islam or losing their civil right to be "protected", which in some instances meant being killed. Copts, despite additional sumptuary laws that were imposed on them in 750-868 A.D. and 905-935 A.D. under the Abbasid Dynasties, prospered and their Church enjoyed one of its most peaceful era. Surviving literature from monastic centers, dating back from the 8th to the 11th century, shows no drastic break in the activities of Coptic craftsmen, such as weavers, leather-binders, painters, and wood-workers.

Throughout that period, the Coptic language remained the language of the land, and it was not until the second half of the 11th century that the first bi-lingual Coptic-Arabic liturgical manuscripts started to appear. One of the first complete Arabic texts is the 13th century text by Awlaad El-Assal (children of the Honey Maker), in which the laws, cultural norms and traditions of the Copts at this pivotal time, 500 years after the Islamic conquest of Egypt were detailed. The adoption of the Arabic language as the language used in Egyptians' every-day's life was so slow that even in the 15th century al-Makrizi implied that the Coptic Language was still largely in use. Up to this day, the Coptic Language continues to be the liturgical language of the Church.

The Christian face of Egypt started to change by the beginning of the second millennium A.D., when Copts, in addition to the "Gezya" tax, suffered from specific disabilities, some of which were serious and interfered with their freedom of worship. For example, there were restrictions on repairing old Churches and building new ones, on testifying in court, on public behavior, on adoption, on inheritance, on public religious activities, and on dress codes. Slowly but steadily, by the end of the 12th century, the face of Egypt changed from a predominantly Christian to a predominantly Muslim country and the Coptic community occupied an inferior position and lived in some expectation of Muslim hostility, which periodically flared into violence. (http://www.coptic.net/)