If this girl is mentally impaired, then how does she possess the advanced reasoning and philosophical skills needed to choose a religion?
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a person rarely gets to choose a religion, most follow in the family tradition or go non religious. when someone does choose a religion it often comes down to family or pier group advice/pressure or the local norm/national religion. the fact that the girl is mentally impaired has to be carefully considered
suggests the girl has a mental age of less than 14.
this could mean a lot of things, ability to engage in social interactions, motor skills, ability to perceive the world. take my sister at 26 her ability to interact socially and ability to live alone are both impaired but her academic IQ is borderline genius, so be careful making assumptions based on blanket statements.