For hundreds of years the ten commandments have been taught by Christians to the children.
Jesus also stated the first and the second commandments as "summing up the entire law and the prophets" That was a powerful statement that he made.
Many of the religious rules that are observed by Jews are in fact interpretations and regulations.
But that's not saying if a believing man wants to follow such things because his conscience demands it of him and to him all other things are a sin, that we should somehow try and dissuade him! that would be paramount to us leading a brother into sin and causing him to fall.
Paul is quite plain about this when he speaks of eating meat, to one man it is not a sin to another it is.
not everyone has been given the same measure of faith.
God put paid to other aspects of Judaism such as killing gentiles or Philistines when He cast Israel from the land and the Jews had to live under foreign rulers and abide by the laws of the lands they found themselves in.
The Apostles didn't yoke the gentiles with Judaism as they where Spirit filled and inspired
"This is the covenant I will make with them after that time, says the Lord. I will put my laws in their hearts, and I will write them on their minds." Heb 10:16
The Christian has the law within him as he has the Spirit of God.
Acts 15:19
“It is my judgment, therefore, that we should not make it difficult for the Gentiles who are turning to God.
20Instead we should write to them, telling them to abstain from food polluted by idols, from sexual immorality, from the meat of strangled animals and from blood.
21For Moses has been preached in every city from the earliest times and is read in the synagogues on every Sabbath.”
and in later years we have the law of Moses in our Bibles.
If a man believes he is sinning then he is sinning.
The law still stands, the penalty for trespass of the law is paid for those who believe, But non the less it still stands.