Your friend saw this resource on bethinking.org and thought you should see it:
Sceptical About Forgiveness Through the Cross?
Why is there a cross in every church and around many a neck?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jesus-for-sceptics/sceptical-about-forgiveness-through-the-cross
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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.