Your friend saw this resource on bethinking.org and thought you should see it:
Are the Resurrection Stories Borrowed from Pagan Myths?
It's often claimed that Jesus' followers borrowed existing pagan beliefs about resurrection. Is that true?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/did-jesus-rise-from-the-dead/resurrection-pagan-myths
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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.