Your friend saw this resource on bethinking.org and thought you should see it:
Can We Trust the Gospels?
In this academically robust but accessible book, Peter J Williams addresses the trustworthiness of the Gospels.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/bible/can-we-trust-the-gospels-review
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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.