Your friend saw this resource on bethinking.org and thought you should see it:
Sharing Jesus with Sikh Friends
An introduction to Sikh beliefs and practices, with helpful advice for sharing the gospel with Sikh friends.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/eastern-religions/sharing-jesus-with-sikh-friends
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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.