Your friend saw this resource on bethinking.org and thought you should see it:
New Research on Gospel Contradictions
Sean McDowell interviews Mike Licona on how his research into ancient biographies sheds light onto Gospel contradictions.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-the-bible-reliable/new-research-on-gospel-contradictions
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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.