Your friend saw this resource on bethinking.org and thought you should see it:
Setting the record straight on the Church's dark history
Marcus K Paul's book 'The Evil That Men Do' offers a more balanced view of church history; acknowledging the good as well as the bad.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-religion-harmful/the-evil-that-men-do-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.