Upon reading Learning in War Time, I began to disagree with one of C.S. Lewis' statements. That, unless for the glory of God, every action we do is a sin. I understand that the smallest decisions are impacting and that everything in this world is sacred, but I find it difficult to see every action not associated with God being a sin. There are many truths about life spoken by non-Christians that are adapted by the church.
Charles Darwin (some churches)
Albert Einstein, agnostic
Was Charles Darwin's breakthrough on evolution a sin? I understand that it is not for the glory of God, but I see it as a lukewarm action. God is truth. I don't see a non-Christians discovery of truth to be a sin. Sins are a detriment not only to the person doing it but everyone around them.
I may just be looking at it wrong, but that's my feelings.