Your friend saw this resource on bethinking.org and thought you should see it:
Altars to Unknown Gods
John Drane investigates what the New Age is, where its beliefs come from and how Christians can respond to its followers thoughtfully and lovingly.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/eastern-religions/altars-to-unknown-gods
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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.