Your friend saw this resource on bethinking.org and thought you should see it:
Jesus for Sceptics - Introduction
Jesus for Sceptics is a book written for those who are sceptical about Jesus but are open to considering the evidence about him.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jesus-for-sceptics/introduction
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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.