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In page Southeast Asia:

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Countries in Southeast Asia practice many different religions and the region is home to many world religions including Abrahamic, Indian, East Asian and Iranian religions. By population, Islam is the most practised faith with 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 is constitutionally the official religion in Malaysia and Brunei.[2][3] The majority of the Muslim population is Sunni, with very minority Shia population. A minority are Sufi or Ahmadiyya Muslims.[citation needed]