Your friend saw this resource on bethinking.org and thought you should see it:
Angels, Wise Men and a Baby: Why Doesn’t God Show Himself?
A look at how the events of the first Christmas show God has given us enough evidence for us to be confident that he is there and that he loves us
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.