Galatians 5:1-6

It is for freedom that Christ has set us free. Stand firm, then, and do not let yourselves be burdened again by a yoke of slavery.

(v1, NIV)

As simple as it sounds, it is for freedom that Christ set us free. Since we were set free so that we could live in freedom, we should not live in slavery. If the choice is between being a slave and being free, why would you choose slavery?

Were you a slave when you were called? Don't let it trouble you—although if you can gain your freedom, do so.

(1 Corinthians 7:21, NIV)

Here, Paul is instructing to live as you were called. So, if you were called as a slave, you should remain as such. However, he steps back and mentions that if you have the chance to become free, then you should take hold of that opportunity.

Mark my words! I, Paul, tell you that if you let yourselves be circumcised, Christ will be of no value to you at all. Again I declare to every man who lets himself be circumcised that he is obligated to obey the whole law.

(v2-3, NIV)

Christ is useless if you accept circumcision. Paul has already mentioned this before and this is brought up by him a number of times in the New Testament. By accepting circumcision, he means those who accept circumcision as a means to attain righteousness. However, in order for that to make sense, they would need to follow the entire law.

You who are trying to be justified by law have been alienated from Christ; you have fallen away from grace. But by faith we eagerly await through the Spirit the righteousness for which we hope. For in Christ Jesus neither circumcision nor uncircumcision has any value. The only thing that counts is faith expressing itself through love.

(v4-6, NIV)

Jesus is the way and the only way. If we are to choose any other way, we are no longer following Jesus. It's not like the toppings of a pizza. For a pizza you can get one with pepperoni, mushrooms and pineapples one it if you want. You can also get one with Italian sausage and green peppers. If you really wanted to, you can get just get cheese. The choice to follow Jesus is not like that. You can either follow Jesus or follow another way. If you choose to attain righteousness through circumcision, you cannot follow Jesus at the same time. Really, circumcision amounts to nothing. It really doesn't matter whether you're circumcised or not.