Your friend saw this resource on bethinking.org and thought you should see it:
Karl Barth and Natural Theology?
An examination of history, evidence, faith, fideism and natural theology.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-christianity-true/karl-barth-and-natural-theology
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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.