Yes, OP, there are many Christians in Egypt today. It's obviously not a Christian society anymore (Christians were probably a numerical minority there by the turn of the millennium, roughly 350 years after the Arab Muslim invasion in the 640s), but the Christian population that is there has deep roots. St. Mark the Evangelist (writer of the Gospel according to St. Mark) started the Church there within about 10-15 years of Christ's ministry. According to tradition, St. Mark was a Hellenized Jew from Libya who went to neighboring Egypt to preach the gospel of Christ there c. AD 46 (though some sources place him there a bit later, c. AD 51; there is much more agreement about the date of his martyrdom in Egypt, in AD 68).
I am Coptic Orthodox (Coptic = Egyptian), though not an ethnic Egyptian person, so I've never been there. Pretty much everyone I know has been, though, and still go back regularly to visit family who still live there (for weddings, baptisms, etc). Most Copts still live in Egypt, though there is not a reliable estimate of the number of Copts in Egypt, since that is a politically-sensitive question in Egyptian society. The government figure of between 5 and 6 million is almost certainly an underestimation, while some Coptic advocacy groups in the West throw around crazy numbers like 15 to 20 million. That's too high. The real number is probably somewhere in between, say 8 to 10. (If we add in the diaspora as well as the neighboring countries' Christians which have traditionally been within the Coptic Orthodox Church, as in Sudan and Libya, that definitely increases the total by several million, but then we're not talking just about Egypt anymore.)
One thing it might interest you to know is that the Coptic Orthodox Church still uses the Coptic (Egyptian) language in its services. It is not spoken outside of church anymore, but it was also never completely lost since the Church kept using it even after the Coptic people stopped speaking it natively in the 14th-15th century or so. It sounds like this:
(In this video, the hymn is sung in alternating verses of Coptic and English, since this service was recorded in New York, not in Egypt. In America, we use English, Coptic, and Arabic in the liturgy, while in other countries we will use whatever the native language is plus Coptic and Arabic; the Arabic is mainly for the older generation or very recent immigrants who might not know enough English to participate in church services in the language.)