http://cnsnews.com/news/article/christian-workers-gulf-countries-warned-about-saudi-cleric-s-call-destroy-churches

Churches are outlawed in Saudi Arabia, but other Arab Gulf states do tolerate a limited number of non-Islamic places of worship, for mostly foreign Christians and small groups of local believers.
On March 12, the Saudi grand mufti, Sheikh Abdul Aziz Al-Asheikh, told a visiting Kuwaiti delegation that all churches in the Arabian Peninsula should be destroyed. He cited Mohammed as having said on his deathbed ­ according to a hadith ­ ³There are not to be two religions in the [Arabian] Peninsula.²