Your friend saw this resource on bethinking.org and thought you should see it:
Life after God? - The Ethics of Peter Singer
A careful examination and critique of the ethical approach proposed by philosopher Peter Singer.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/morality/life-after-god-the-ethics-of-peter-singer
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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.