Good ole Galatains, one of the most misunderstood books in the bible. The issue on what Paul is addressing in the majority of this chapter like in other parts of the NT, was the circumcision party. Just like in the book of Acts, they were going around telling people they must first be circumcised in order to be saved and there is no where in the bible that says you are not saved unless you are circumcised in the flesh.
When Paul keeps talking to them about the law, he is addressing the fact that law keeping and rejecting the Messiah, by thinking all you need is the law and not him, will end you under a curse of the law, which is death. Jesus snailed the penalty of the law to the cross for all those that belie in him. If you reject the Messiah, you have no grace. So that verse Gal 5:4 is correct in which if you try to justify yourself by the law and think circumcision gives you salvation, you have fallen from grace.
You can cherry pick verses all day long to have them mean what you want, but when you look at the whole issue in context , thing make more sense.
1 John chapter 4
7 Dear friends, let us love one another, for love comes from God. Everyone who loves has been born of God and knows God
The only thing that counts is faith expressing itself in love.Galatians chapter 5 verse 6
Since most people misunderstand Galatians as you say maybe they should look at this.
Matthew chapter 4 verse 4
Jesus answered, "It is written: 'Man shall not live on bread alone, but on every word that comes from the mouth of God.'"
Romans chapter 1 verse 28
Furthermore, just as they did not think it worthwhile to retain the knowledge of God, so God gave them over to a depraved mind, so that they do what ought not to be done.
John chapter 8 verse 31,32
To the Jews who had believed him, Jesus said, " If you hold to my teaching, you are really my disciples. Then you will know the truth, and the truth will set you free.
2 John
9 Anyone who runs ahead and does not continue in the teaching of Christ does not have God; whoever continues in the teaching has both the Father and the Son.
Job chapter 23 verse 12
I have not departed from the commands of his lips; I have treasured the words of his mouth more than my daily bread.
Matthew 11
28 “Come to me, all you who are weary and burdened, and I will give you rest. 29 Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. 30 For my yoke is easy and my burden is light.”
Luke chapter 21
33 Heaven and earth will pass away, but my words will never pass away.
Romans chapter 10
17 Consequently, faith comes from hearing the message, and the message is heard through the word about Christ.
Mark chapter 13
31 Heaven and earth will pass away, but my words will never pass away.
James chapter 1
25 But whoever looks intently into the perfect law that gives freedom, and continues in it—not forgetting what they have heard, but doing it—they will be blessed in what they do.
James chapter 4
8 Come near to God and he will come near to you. Wash your hands, you sinners, and purify your hearts, you double-minded.
Isaiah chapter 45 verse 19
I have not spoken in secret, from somewhere in a land of darkness; I have not said to Jacob's descendants, 'Seek me in vain.' I, the LORD, speak the truth; I declare what is right.
Jeremiah chapter 9
24 but let the one who boasts boast about this:
that they have the understanding to know me,
that I am the Lord, who exercises kindness,
justice and righteousness on earth,
for in these I delight,”
declares the Lord.
Jeremiah chapter 5 verse 1
5 “Go up and down the streets of Jerusalem,
look around and consider,
search through her squares.
If you can find but one person
who deals honestly and seeks the truth,
I will forgive this city.