Allah's promise to Prophet still valid: Islam shall conquer Rome

"The tidings are still valid… about the conquest of Rome, Allah willing. Just as Constantinople was conquered about 500 years ago, so Rome is destined to be conquered. Of what use are all of our prayer and our fasting and our giving of charity, if we doubt the words of the Prophet? How shall we follow the proper path if we do not believe, depend and trust, in the conquest of Rome, Allah willing, as He promised to Muhammad? … Allah, raise up for Islam a state that will glorify Islam and its people, and will humiliate blasphemy and its people…"