It goes without saying that it is rude to cause disturbance.Remember, he was saying 1,000 Muslims, with prayer mats entering a Catholic Church during a time of Catholic worship. If they enter at such a time, they would be welcome to be a part of the Catholic rite, but not to begin their own rite.
Are you saying one thousand Catholics would be welcome to enter a Muslim place of prayer during Muslim prayer time and begin to say Mass? Or, like the Catholic Church is it open for individual people to join in (or quietly observe) the rite in progress?
I'm talking about the Islamic ruling that it is permissable for Muslims to pray in church provided there are no pictures or statues there.