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http://www.indiatomorrow.net/eng/were-born-as-hindu-but-will-die-as-muslim-say-dalits-after-conversion
Oppression by Brahmins made lower castes embrace other faiths especially Islam. The best example is the Meenakshipuram incident in Tamil Nadu..in 1981 is recorded in the History....entire village(300 families) had accepted Islam..(Google it !!!)
https://en.m.wikipedia.org/wiki/1981_Meenakshipuram_conversion
Swami Vivekananda writes,
“Why amongst the poor of India so many are Mohammedans? It is nonsense to say, they were converted by the sword. It was to gain their liberty from the . . . zemindars and from the . . . priest”
http://www.ramakrishnavivekananda.info/vivekananda/volume_8/epistles_fourth_series/034_diwanji.htm