Explanation of why Paul was concerned about circumcision.

In Galatians chapter 1, Paul begins his epistle with a sharp reproof. He says, “I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel. Which is not another; but there be some that trouble you, and would pervert the gospel of Christ” (Galatians 1:6-7). To what was Paul refer to in this rebuke? The early disciples of Christ often had a hard time making adjustments to their newly formed faith. They often had a hard time reconciling the Law of Moses with the New Law. The disciples in Galatia had a hard time adjusting to the New Law in that they wanted the new converts to Christianity to be circumcised, as was the custom with the Law of Moses.
Many of the new converts in that area were not already Jewish, meaning they had not been circumcised. Not only had the disciples thrown aside the New Law and the Atonement of Christ by forcing new converts to be circumcised, but also they undoubtedly drove a few potential converts away, at the prospect of the pain that inherently accompanies circumcision.
Paul’s mission was to bring all souls unto Christ. This mission was being deterred by the stubborn and prideful converts who wanted to integrate their faith with the Gospel of Jesus Christ. In the next verse Paul says, “But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed” (Galatians 1:8). The members of the church in that area were looking beyond the mark. They were going off the path that Paul had already laid out for them.
We can learn a valuable lesson from this rebuke. So many times, we as members of the church look beyond the mark and claim that certain ideas or principles that they regard as important, is actually doctrine. Sometimes they may use words of the General Authorities (often taken out of context) as justification for their ideas. These ideas can be a major deterrent for potential converts to the Gospel. This is why, as missionaries, we were taught to teach only out of “Preach My Gospel” and the scriptures. Apostasy arises when the Gospel is twisted to meet a member’s ideals. The atonement of Jesus Christ is perfect and needs no addition to the doctrine of the gospel, and when some seek to do so, the are, as Paul mentions, accursed.