Iranian religion. By population, Islam is the most practised faith, numbering approximately 240 million adherents, or about 40% of the entire population, concentrated in Indonesia, Brunei, Malaysia, Southern Thailand and in the Southern Philippines. Indonesia is the most populous Muslim-majority country in the world. Meanwhile, Islam becomes the official religion in Malaysia and Brunei by constitution. Majority of the Muslim population is Sunni adherence, meanwhile there is also significant Shia Muslim such as in Thailand and Indonesia. The minority of the Muslim population may include Sufi Muslim or Ahmadiyya Muslim community. There are approximately 205 million Buddhists in Southeast Asia, making it the second-largest religion in the region, after Islam. Approximately 38% of the global Buddhist population resides in Southeast Asia. Buddhism is predominant in Vietnam, Thailand, Laos, Cambodia, Myanmar and Singapore. They may come from Theravada or Mahayana school. Ancestor worship and Confucianism are also widely practised in Vietnam and Singapore. Taoism is also widely practised by the overseas Chinese community in Malaysia, Singapore and Thailand. Chinese folk religions are also widely practised by the overseas Chinese community such as Mazuism. In certain cases, they may include Chinese or local deities in their worshipping practises such as Tua Pek Kong, Datuk Keramat and many more. Christianity is predominant in the Philippines, eastern Indonesia, East Malaysia, and East Timor. The Philippines has the largest Roman Catholic population in Asia. East Timor is also predominantly Roman Catholic due to a history of Indonesian and Portuguese rule. In October 2019, the number of Christians, both Catholic and Protestant in Southeast Asia, reached 156 million, of which 97 million came from the Philippines, 29 million came from Indonesia, 11 million came from Vietnam, and the rest came from Malaysia, Myanmar, East Timor, Singapore, Laos, Cambodia and Brunei. In addition, Eastern Orthodox Christianity can also be found in the region. Besides that, the practice of Judaism can be observed in certain countries such as in the Philippines, Singapore and Indonesia due to the presence of Jewish diaspora. Additionally, there is also a small population of Parsis in Singapore who practised Zoroastrianism. Baha`i is also practised by very small population in Malaysia, Vietnam, Singapore and Thailand. No individual Southeast Asian country is religiously homogeneous. Some groups are protected de facto by their isolation from the rest of the world. In the world's most populous Muslim nation, Indonesia, Hinduism is dominant on islands such as Bali.