Answer:
They are ethnically Jewish ultra orthodox group, which believe in "Jesus as the messiah", and just recently affiliated themselves as a Christian denomination.
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Saying they are Christians now, does not give credence to the many new religions they started and abandoned, that has led them from Jewish beliefs to Christian ideology.
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Part of Judaism awareness, is the verbally handed down historical stories, that Amish no long communicate.
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They no longer speak their Hebrew language, but speak German Duesth or Yiddish a mix of Hebrew and German.
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Hebrew letters and words have religious meaning in themselves, expressing a ideological religious theology, which Amish no longer know about.
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Amish elders are aware of their Jewish historical past, most of members not, and these elders are using Christianity like days old to control their members.