Your friend saw this resource on bethinking.org and thought you should see it:
What is the Trinity? Do Christians worship three gods?
One of the most commonly misunderstood ideas in the Bible concerns the teaching about the Trinity. Although Christians say that they believe in one God, they are constantly accused of polytheism…
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.