Your friend saw this resource on bethinking.org and thought you should see it:
Gender Identity and the Body
What does the biblical view of creation have to say in the transgender debate?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/human-life/gender-identity-and-the-body
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bethinking.org is a collection of resources which aims to make sense of the big questions of life about God, Jesus and Christianity.