Your friend saw this resource on bethinking.org and thought you should see it:
Is Jesus History?
Is Jesus History? by Professor John Dickson explores how the life of Jesus and the claims of the Bible intersect with sources from the ancient world.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jesus/is-jesus-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.