Your friend saw this resource on bethinking.org and thought you should see it:
No God But One - a review
Nabeel Qureshi, a former muslim, weighs up the evidence for both Islam and Christianity.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/islam/no-god-but-one-review
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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.