Your friend saw this resource on bethinking.org and thought you should see it:
Not Enough Evidence?: Why God Hides
A response to Bertrand Russell's criticism that God does not provide enough evidence for people to believe in him.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/does-god-exist/not-enough-evidence-why-god-hides
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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.