Galatians 5:3

To be circumcised. That is, with the idea of this being part of his salvation. As a national sign (Acts 16:3) or a health practice, everyone can be circumcised with no change at all in their relationship to Christ. But when a Gentile is circumcised to show he is placing himself under The Law, it cuts him off from the blessings of Christ. To obey the whole Law. Because the Law of Moses was so complicated and required expensive travel back to Jerusalem at certain times of the year, the false teachers told the Gentiles that they would only have to keep certain parts of The Law such as holydays (Galatians 4:10), Kosher dietary rules, not fraternizing with the uncircumcised, etc. Paul says plainly that if you place yourself under The Law, you are obligated to keep the entire mass of rules and regulations!!! Compare James 2:10 and note.