According to "Hinduism and Buddhism An Historical Sketch", Sir Charles Elliot who was a British diplomat mentioned that this correlates with the Rig Veda of Hinduism.
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There were 5 centers specializing in the study of Buddhism, Hinduism, Judaism, secularism/postmodernism and Islam, but now only 4, with Buddhism and Hinduism combining to form "East Asian Religions and Traditions".
Around 300–700 C.E. the seafaring peoples of the islands traveling in balangays began trading with the Indianized kingdoms of Maritime Southeast Asia and nearby East Asian principalities, adopting influences from Buddhism and Hinduism.
Finally, Cowan and Bromley criticize the ICSA list as being so broad that even mainstream organizations such as Evangelical Protestantism, the Roman Catholic Church, Buddhism and Hinduism fall within the criteria.