The Vatican's top cleric in the heart of Muslim Arabia tends to a flock of 2 million Christians spread around six desert nations. But he has to do it quietly: Most of them must still pray in secret and are forbidden to display crosses and other symbols of their faith. n this image taken Tuesday... From his base in the emirate of Abu Dhabi on the Persian Gulf, Archbishop Paul Hinder travels the Arabian Peninsula, even slipping in and out of Saudi Arabia - the birthplace of Islam, where restrictions on Christians are the toughest.