Point of information: the doctrine of 'taqiyya' actually originally referred to the Shiite practice of concealing their faith when living in Sunni-ruled territory. Although modern jihadists may have taken over this concept in order to facilitate their terrorist activities, 'taqiyya' is not a foundational concept of Islam. In fact, Moslems originally were completely open about their faith, and made their intentions clear: to conquer the world and subject it to Islamic law. Even today, jihadists are not at all quiet about their intentions, given all the videos they continue to produce and distribute across the world. This practice of 'concealment' only applies to individual terrorists, who hide their faith and their activities in order to elude the secular authorities.
I am not disputing how Islamic rule weakened Orthodox society in the East. In fact, this fact substantially bolsters my point: if the Antichrist will be a Moslem, why do NONE of the prophetic Orthodox saints mention this? I mean, if you can find even one saint who foretells this, that would strengthen your argument considerably.
I find it much more plausible that the Antichrist will come out of the indifferent, morally degenerate culture of the modern West than from the world of fanatical Islam: the former is even closer to the spirit of Satan than the latter. Read the Book of Revelation, where St John speaks to the church of Laodicea, which was 'neither hot nor cold'.
The current tense political situation is leading to the judgment of the world, the opening of the seals on the book, that precedes Antichrist and the Last Judgment. God will destroy the nations and civilizations of today for their abandonment of true worship, and a period of repentance and renewal of the Church will follow. But this itself will end when the world is given over to Antichrist. From what I understand in the prophecies, Antichrist will undertake a great deception: the world will think they are pious and worshiping Christ, but in fact they will have abandoned God completely and worship the most evil man to have lived. In discussions of the End, I don't think enough attention is paid to the enormity of the deception that will be practiced on believers. People talk of the Antichrist as if he will be obviously opposed to Christ: a Moslem fanatic, for instance. But the prophecies in fact foretell that the deception will be so strong that 'even the elect' may fall for it.