Your friend saw this resource on bethinking.org and thought you should see it:
Did Key Christian Beliefs Slowly Change Over Time?
Did 'core' Christian beliefs slowly change over history? This talk considers: the Gospels; the divinity of Jesus; and the resurrection.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-the-bible-reliable/did-key-christian-beliefs-slowly-change
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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.