Your friend saw this resource on bethinking.org and thought you should see it:
Christianity is True
Ranald Macaulay considers the nature of truth and the revelation to be found in the Bible.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-christianity-true/christianity-is-true
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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.