Your friend saw this resource on bethinking.org and thought you should see it:
Messiah: Jesus, the evidence of history
What historical evidence is there for the life of Jesus and the first Christians?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jesus/messiah-jesus-the-evidence-of-history
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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.