Islam in Malaysia: Source WIkipedia

Malaysia is a multidimensional country with Islam being the largest practiced religion, comprising approximately 61.4% Muslim adherents, or around 17 million people, as of 2010. Article 3 of the Constitution of Malaysia establishes Islam as the "religion of the Federation". However, Malaysia's law and jurisprudence is based on the English common law. Sharia law is applicable only to Muslims, and is restricted to family law and religious observances. Therefore, there has been much debate on whether Malaysia is a secular state or an Islamic state.

Originally, the draft Constitution of Malaysia did not specify any official religion for the state. This move was supported by the rulers of the nine Malay states, who felt that it was sufficient that Islam was the official religion of each of their individual states. However, Justice Hakim Abdul Hamid of the Reid Commissionwhich drafted the Constitution came out strongly in favour of making Islam the official religion, and as a result the final Constitution named Islam as the official religion of Malaysia. All ethnic Malays are Muslim (100%) as defined by Article 160 of the Constitution of Malaysia. As required by Malaysian law and defined in the Constitution of Malaysia, a Malay would surrender his ethnic status if he were not Muslim.