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The Osings are mostly adherents of abangan Islam, although there are some who follow Hinduism. Elements of animism can be seen in their religion too. The Osings share a similar culture and spirit with the Balinese, and the Hindus celebrate ceremonies like Nyepi. It is not uncommon to see mosques and puras (Hindu temples) to be built nearby to each other in Banyuwangi. About 2-3,000 of them are Christians, who also mix some Hindu or Muslim beliefs into their religion.
The history of the Osings date back to the end of the 15th century, at the time of the fall of Majapahit; to resist conversion to Islam, many of them fled east to Banyuwangi, Bali and Lombok. It was converted to Islam by the Muslim Makassars in the 16th century. The remaining Hindu princes from Majapahit established the Kingdom of Blambangan, which stretched from the Blambangan peninsula right up to the Tengger mountains of Central Java. Blambangan held sway for slightly more than two hundred years before they finally surrendered to the second Mataram Sultanate in 1743. Even then, it did not officially convert to Islam until the 19th century, though small communities of Muslims do pre-exist this date. The cause of the Osing's conversion is that, during the 19th century, when Banyuwangi was still unscathed by the Dutch colony, but knowing that by launching an attack on Banyuwangi, they will lose out in the battle as the Hindu principal puputan was a fight-to-death, the Dutch sent Muslim and Christian missionaries to tame the fighting spirit. Only then Banyuwangi was captured, a long and ambitious dream toward further occupation on Bali was launched by the Dutch.
In spite of the Dutch attempts to propagate Islam and Christianity among the Osings, many still stuck to their old beliefs. Today, a large Hindu population still exists among the Osings.