Your friend saw this resource on bethinking.org and thought you should see it:
The Gospels and the 'so-called' gospels
A discussion of Christian beliefs about the divinity of Jesus and why the New Testament did not include other 'gospels'.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-the-bible-reliable/the-gospels-and-the-socalled-gospels
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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.