Does today's society no longer know what sin is?

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I'm going to explain what sin is in a very simple way because I see that there are people here who have no idea about it. A serious sin is anything that violates the 10 commandments.
I asked the question because in the Western world the impression I have is that the current generation does not know, for example, that having sex outside of marriage is a sin, or using the holy name of God in vain is also a sin.
Does today's society no longer know what sin is?
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