The Secondary conversion reference article from the English Wikipedia on 24-Apr-2004
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Secondary conversion

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In the sociology of religion, secondary conversion is conversion to a religion not due to any inherent attractiveness of the religion, but rather due to a pre-existing relationship with another convert to the religion. For example, someone might join a religious group primarily because their spouse or partner is doing so; such a person would be a secondary convert. Secondary converts are people who join a religion only because of a relationship with the other convert.