In order for the Man of Sin to declare himself God, he must have access to the Jewish Temple. How is he going to do that? Believe it or not, the Vatican has been working for some time (yes, again, centuries after the Crusades), on managing, or gaining control of Jerusalem.
In 2011: The Israeli government and the Vatican are deadlocked in discussions over the status of the religious sites. Vatican officials are now reiterating their demand for control over the religious sites in the ancient and holy city founded by King David as the capital of ancient Israel and now the capital of the reestablished Jewish state.
Satan always tries to copy what God does, and in his vain imaginations, he tries to pull it off better. Islam is Satan's mockery of Christianity, and their end-time beliefs are near photo-copy negative of what scripture teaches. They believe that their Madhi is returning (instead of the true Messiah), that he will be accompanied by a prophet, the Muslim Jesus, who will point all people to the Madhi (false prophet?). They even believe the Madhi will be killed after 7 years, by the antichrist (the Bible says this is when Yeshua returns on his white horse with his heavenly army)!
My wife and I believe that the "Jesus Christ" who accompanies Mahdi/Maitreya/World Teacher, etc. will be none other than the progressive "Vicar of Christ" who holds sway of millions throughout the world. And if you haven't heard it yet, St. Malachy gave a prophecy that says the current Pope is the final one, and that the great Judge will return at the end of that Pope's reign
If you don't know Jesus as your Savior and Lord, and want to escape eternal damnation in a lake of fire, ask God to forgive you of your sins (for all have sinned and fall short of the glory of God-Rom. 3:23), and turn from those sins in your thinking! Ask Jesus to come into your life to be your LORD and Savior, and He sill save you (Rom. 10:9-10, 13)!