Gal 1:6 I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
Gal 1:7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
Gal 1:8 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.
Gal 3:1 O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?
Gal 5:2 Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
Gal 5:3 For I testify again to every man that is circumcised, that he is a debtor to do the whole law.
Gal 5:4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
You're taking one verse completely out of context to arrive at the thought that Paul was hypocritical. The Galatians had a specific problem they were leaving Christ and going to Moses. When Paul tells them if you be circumcised Christ profit you nothing. He was telling them that if they left Christ returning to the law they would be what we call abrogating or committing the unforgivable sin.
Heb 6:4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
Heb 6:5 And have tasted the good word of God, and the powers of the world to come,
Heb 6:6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
Heb 10:38 Now the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him.
Heb 10:39 But we are not of them who draw back unto perdition; but of them that believe to the saving of the soul.
Leaving Jesus failing to repent is a terrible thing and its possible for us to give up our salvation to follow another and false system. The warning about circumcision is to tell them if they go through with this in their case demonic ceremony they would be losing all the work of Christ in their life.
1Co 7:18 Is any man called being circumcised? let him not become uncircumcised. Is any called in uncircumcision? let him not be circumcised.
1Co 7:19 Circumcision is nothing, and uncircumcision is nothing, but the keeping of the commandments of God.
1Co 7:20 Let every man abide in the same calling wherein he was called.
1Co 7:21 Art thou called being a servant? care not for it: but if thou mayest be made free, use it rather.
Gal 5:6 For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.
Luk 2:21 And when eight days were accomplished for the circumcising of the child, his name was called JESUS, which was so named of the angel before he was conceived in the womb.
Now if you look rationally at Galatians and the other surrounding books you'll see that circumcision or uncircumcision matters not. Its just something tied to who you started out being when you met Jesus. If you have a good reason to need circumcision or uncircumcision then you should do either just like if you were a slave and you found a way to seek freedom you could. Our genitals mean very little to Christ and Christ wants our focus not to be on the our natural bodies but on the work of His Kingdom in the Earth.