Your friend saw this resource on bethinking.org and thought you should see it:
But Is It True? - a review
“If Christianity is not true, then it’s not worth believing” - This book addresses common objections to Christian truth claims.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-christianity-true/but-is-it-true-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.