Your friend saw this resource on bethinking.org and thought you should see it:
Exclusivity: How can there be just one true religion?
With so many different religions and ways of viewing the world, how can Christians claim their way is the right one?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-christianity-the-only-way/exclusivity-how-can-there-be-just-one-true-religion
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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.