well I'm not Christian, but IMO.....
Most able bodied people live in a specific country because they hold to the values and principles of it. So if you decide to break the law, then you go against the people of that country. That itself does not make breaking the law a bad thing.
I personally think that no Government should have the right to rule over me, but rather under me, as every other person in the free world. That's what democracy is. You abide by laws because they follow your ideals, and as a free person you have the responsibility to make sure that you're a good citizen. Otherwise the government can intervene to protect the other members of society.
So IMO, you can sin by breaking a law since no human can rule over another, but can only sin by going against your own principles. If you live in a Communist country though, then.........well your principles are really screwed up and your screwed too.