Your friend saw this resource on bethinking.org and thought you should see it:
Allah vs. Yahweh / Tawhid vs. Trinity
One of the most common points on which Muslims attack Christians is on the whole question of the nature of God: in short, is God uni-personal or multi-personal? Does the doctrine of Tawhid…
See the full resource online by visiting bethinking.org:
is a collection of resources which aims to make sense of the big questions of life about God, Jesus and Christianity.