Your friend saw this resource on bethinking.org and thought you should see it:
Dialogues on Jehovah's Witnesses
These two dialogues explore some of the key areas where Jehovah's Witnesses differ from mainstream Christianity, to help in sharing faith with Jehovah's Witnesses.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jehovahs-witnesses/unbelievable-jehovahs-witnesses-dialogues
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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.