Your friend saw this resource on bethinking.org and thought you should see it:
The arrogance of Christianity
Links to further resources to follow up on the bethinking booklet 'The arrogance of Christianity: is Jesus the only way?'.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/booklets/arrogance
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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.