Islam in Malaysia in the context of "Spread of Islam in Southeast Asia"

Cultural Muslims, also known as nominal Muslims, non-practicing Muslims or non-observing Muslims, are people who identify as Muslim but are not religious. They may variously be non-observing, secular, irreligious, or individuals who still identify with Islam due to belief, sprituality, family backgrounds, personal experiences, ethnic and national heritage, or the social and cultural environment in which they grew up.

Cultural Muslims can be found across the world, but especially in the Balkans, Central Asia, Europe, the Maghreb, various countries in South Asia and West Asia, Russia, Turkey, Singapore, Malaysia, Indonesia and the United States. In several countries and regions, self-reported Muslims practice the religion at low levels, and for some, their "Muslim" identity is associated with cultural or ethnic or national heritage, rather than merely religious faith.

Islam in Asia began in the 7th century during the lifetime of Muhammad. In 2020, the total number of Muslims in Asia was about 1.3 billion, making it the largest religion in Asia. Asia constitutes in absolute terms the world's largest Muslim population, and about 62% of the world's Muslims live in Asia, with Indonesia, Pakistan, India, Bangladesh and Malaysia having the largest Muslim populations in the world. Asia is home to the largest Muslim population, with West Asia, Central Asia, South Asia, and Southeast Asia being particularly important regions. A number of adherents of Islam have lived in Asia especially in West Asia and South Asia since the beginning of Islamic history.

Islam is the most widely practised religion in Southeast Asia with approximately 242 million adherents in the region (about 42% of its population), with majorities in Brunei, Indonesia and Malaysia as well as parts of southern Thailand and parts of Mindanao in the Philippines respectively. Significant minorities are located in the other Southeast Asian states like Singapore and Cambodia. Most Muslims in Southeast Asia are Sunni and follow the Shafi'i school of fiqh, or religious law. It is the official religion in Malaysia and Brunei while it is one of the six recognised faiths in Indonesia.

Islam in Southeast Asia is heterogeneous and is manifested in many different ways. In some places in Southeast Asia, Islam is adapted to coexist syncretically with already-existent local traditions. Mysticism is a defining characteristic of Islam in Southeast Asia, with Sufism having a large regional following. Mystic forms of Islam fit in well with already established traditions. The adaptation of Islam to local traditions is seen as a positive thing by Muslims in Southeast Asia. Islam is part of everyday life for adherents in Southeast Asia and is not separated from "non-religious realms". Southeast Asia is the global region with the highest number of Muslims in the world, surpassing the Middle East and North Africa. Islam in Southeast Asia is neglected in Western study of Islam which centers around the Middle East.

Article 160 of the Constitution of Malaysia defines various terms used in the Constitution. It has an important impact on Islam in Malaysia and the Malay people due to its definition of a Malay person under clause 2. It took effect after 31 August 1957 ("Merdeka Day" or "Independence Day") in the Federation of Malaya (now Peninsular Malaysia), and took effect in Singapore and East Malaysia when they merged with Malaya in 1963 to jointly form Malaysia. Although the article no longer applies to Singapore since its separation from Malaysia in 1965, it does affect the legal status of Malay Singaporeans when they enter Malaysia.