Are you saying there is a difference between the LAW and the law?
Sure there is. In that verse I showed you a totally non-scriptural practice (jews refusing to eat with gentiles) and it was referred to as a "work of the law".
It was a law of the Jews, but not a scriptural one. There are (or were) thousands of such laws which were a burden to the Jewish people.
For example:
Joh 5:8 Jesus said to him, "Rise, take up your bed and walk."
Joh 5:9 And immediately the man was made well, took up his bed, and walked. And that day was the Sabbath.
Joh 5:10 The Jews therefore said to him who was cured, "It is the Sabbath; it is not lawful for you to carry your bed."
It was against the law for a man to carry a bed on the sabbath...where is that in scripture? I'll save you the time...it doesn't exist. It was a law added by the Jews.
So yes, there are two laws. Laws of men and laws of God.