Galatians is also one of Paul's letters to the church. This letter initially discusses/chastises the use of different gospels. Paul defends the true gospel and discusses his calling by God and why he opposed Peter. He then switches his discussion to the law and what it means to be a sons of God. And Paul ends his letter with the freedom and life you get by becoming a son of God.
Galatians 5: 22-26 is my favorite passage from this book of the bible. This passage explains the essence of being a Christian. The old self has been crucified, has passed away. The new self is filled with the Spirit and we, as Christians and part of the church, have to "keep in step with the spirit." I think that some people confess their sins on Sunday, but don't keep up with the spirit during the week. This is something I struggle with day to day. I have to be in constant communication in order to keep up with the spirit-just like keeping up with school work, you have to continually be working on it. I think that this message not only applies to the churches in Galatia, but to churches today too.