The idea of causing pain, destruction, AKA harm; these ideas have been around long before Christianity. But even if I am wrong; I will continue to assume sin to be a religious term, and harm to be a secular term until proven otherwise
Don't you need to back it up? That was your demand of me.
Depending on how one defines Christianity, yes the concept came before Christ's birth, but that still doesn't mean it was secular.
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[edit] FYI, the first use of what is translated "harm" in the Bible (AFAIK) is in Genesis 31:52. It is the Hebrew word
ra' ra'ah, which comes from the Hebrew word for evil. So, we might quibble over when Genesis was writen, but I expect we would agree it came before my 1959 quote from the law journal.
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[edit 2] In doing a little further research on the etymology of the word "harm", it originates from the Old Norse language, which was a proto-germanic language. But chasing the word probably wouldn't get you to the root of the concept.
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=etymology of harm
http://en.wikipedia.org/wiki/Old_Norse#Relationship_to_other_languages
Rather, it's probably better to think in terms of locating a similar concept in the oldest known language. Now, the "oldest" language is itself a problematic concept because of the fluid manner in which language develops. Still, looking at something like Sumerian, for which extant writing is the oldest, might be a reasonable approach.
In Sumerian, the closest analogy to the idea of "harm" is the word "anzillu", which means an abomination.
https://en.glosbe.com/en/sux/harm
According to
Sennacherib's Campaign to Judah: New Studies by William R. Gallagher (p. 120), the word was first used to mean the breaking of an oath(*) and its earliest occurrences are in "magical texts, wisdom literature, and penitential psalms", for example in the Legend of Etana (a rather mythio-religious story, where, interestingly enough, Etana is the first king to rule after the flood).
http://en.wikipedia.org/wiki/Etana
(*) Note: If true that this is the first concept of harm, it is interesting that it is connected to oaths - the ancient contract - and community relations, given that has been my main point all along.