Your friend saw this resource on bethinking.org and thought you should see it:
Why Should I Believe God Exists?
An overview of some reasons to believe in God, with links to fuller resources and some recommended books.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/god/why-should-i-believe-god-exists
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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.