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In page Champa:

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Islam started making headway among the Cham after the 10th century AD. By the 17th century, the royal families of the Cham had converted to Islam. Most Cham are now evenly split between being followers of Islam and Hinduism, with the majority of Vietnamese Cham being Hindu while the majority of Cambodian Cham are Muslim, though significant minorities of Mahayana Buddhists continue to exist.