Let them just discuss among themselves.
The prayer for the Moslems is wonderful, but the reason Moslems flock to Fatima is because Jesus (to them Issa or Esau and God said "Esau I have hated") is supposed to come back at the end times and according t them, he's going to slay every Christian who doesn't bow down to Mohammed according to the Moslems. Why should we get excited about that? If Protestants followed a scripture that said that the Pope in the last days is going to kill all Catholics who don't convert to Protestantism, I wonder if you'd all be so excited if Protestants were lining up to visit the Vatican, or would you realize they might be lining up to see you killed (in this hypothetical scenario)? You know how they line up to see stonings and public executions in the Moslem world, well that's the concept here.
Catholics don't do this to them. They are free to have their threads about pre-destination, rapture, sola scriptura etc without even a single Catholic screaming about how they are wrong in what they believe. Catholics don't run around damning them to hell or calling their preachers anti-christs for their un-biblical ideas. Yet they always have to come into Catholic/Orthodox discussions to pick fights. Do they actually think they win anyone's hearts with their constant attacks?
So much hatred from people who call themselves christians...
Reporting for duty. :)