While that is all debatable, my real concern is the authors understanding (or explanation) of sin. Sin is not primarily 'wrongs' as in behavior, but a wrong heart. Sin is primarily a heart condition, not a behavior problem. I think I would expand on the fullness of the meaning. For me, the more critical thing is to explain to people what the terms mean. Don't assume they know 'jargon' (which has deep history in common language) but explain it so it deepens them. If we avoid those terms, they will be all the more confused when they see them in the scriptures for themselves.

Your overall point though is good for Christians to be aware of.