If one is going to live by the law - then he is obligated to live by all of it. There are no "parts" to the Law. Saying that some are for us and some are not is just watering down the Law to make it seem "do-able" but in reality "law-keepers" have a very low respect for the Law and in fact break the law every day.
Romans 10:4-5 (NASB)
[SUP]4 [/SUP] For Christ is the end of the law for righteousness to everyone who believes. [SUP]5 [/SUP] For Moses writes that the man who practices the righteousness which is based on law shall live by that righteousness.
We have died to the Law SO THAT we might live unto God.
Galatians 2:19 (NASB)
[SUP]19 [/SUP] "For through the Law I died to the Law, so that I might live to God.
There is no justification or right standing with God because one "keeps the law". Christians live by faith - faith in Christ and what He has already done and we live by His life in us now.
Galatians 3:11 (NASB)
[SUP]11 [/SUP] Now that no one is justified by the Law before God is evident; for, "THE RIGHTEOUS MAN SHALL LIVE BY FAITH."
The Law is NOT of faith and if you practice the Law - you must live by it.
Galatians 3:12 (NASB)
[SUP]12 [/SUP] However, the Law is not of faith; on the contrary, "HE WHO PRACTICES THEM SHALL LIVE BY THEM."
When we are trying to keep the law of which circumcision is a part of - we are obligated to keep the whole law ( Remember there are NO PARTS to the law - it is either all or live by Christ by grace through faith in His finished work on the cross and resurrection )
Galatians 5:3 (KJV)
[SUP]3 [/SUP] For I testify again to every man that is circumcised, that he is a debtor to do the wholelaw.
We can trust the Holy Spirit and the life of Christ in us to lead us into life in Him. Let's eat from the tree of Life - which is Christ Himself in us. The Law is eating from the tree of the knowledge of good and evil. Choose Christ. He is our life. He is the Way, the Truth and the Life.
Colossians 3:3 (NASB)
[SUP]3 [/SUP] For you have died and your life is hidden with Christ in God. ( NOT in the law of Moses )