Your friend saw this resource on bethinking.org and thought you should see it:
Religion and Well-being: Assessing the evidence
Summary from a 2016 Theos Report showing the positive correlation between 'religion' and 'well-being'.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-religion-harmful/religion-and-wellbeing
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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.