OK, so, as a Christian, one is 'saved'.
Once someone is 'saved' they are, then, no longer sinners.
Does that mean, then, that Christians ~ ie people who are 'saved' ~ do not or cannot commit sins?

Christians never break the commandments?
Or laws?
Or do anything wrong at all?

That's isn't correct.

How do we solve this riddle?

As I see it, which I believe is the original belief before modern Christianity, is that a conscious, deliberate, evil sin, as in something done to a completely innocent person, is absolutely different from what we now consider "sin" (lying, covetousness, etc). I do not believe God sees them as the same.

A sinner is a title. Christians like to use the age old word play of "if you steal once, you're a thief. If you lie once, you're a liar." Which I don't think works. If you sin once, you are not a sinner.

I believe strongly that "sinner" is a title placed on those who act against the righteous and innocent. They are the evil individuals, very different from the every day, every persons struggle to "do good." These people don't even struggle to do good, they willfully and gladly and purposefully do evil.

Such a thing can not be put on the same line, as if the two are equal.

I agree.