Your friend saw this resource on bethinking.org and thought you should see it:
Agnosticism Explored
What is agnosticism and is it a sensible approach to take to issues of truth and, in particular, to the claims of Christianity?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/can-we-know-anything/agnosticism-explored
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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.