You understand, of course, that "the Vatican" is a state. The prayer service will take place in the gardens, not inside the basilica. There are muslim tourists who visit the Vatican and offer up prayers all the time. Last year, a muslim attended a peace prayer service that was held in St. Peter's Square. I doubt he was reciting the "Our Father".
I understand what the entire world’s Muslims will understand.
Islamic prayers formally asked into the Vatican in a ceremonial reciting of Quran scripture to the Pope and the Jews, and televised.
This is an incredible territorial coup for Islam.
Once again consider illicit teenage sex in the backyard rather than defiling the parents' bedroom.