That's why I said that you don't understand him. But this is not the thread for trying to fit an entire book study into this or any other thread.
But I'll boil it down for you. ch 1-3 are basically about hypocrisy, even though James never used the word.
Just consider these 2 verses:
James 2:15-16
15 Suppose a brother or sister is without clothes and daily food. 16 If one of you says to him, "Go, I wish you well; keep warm and well fed," but does nothing about his physical needs, what good is it? NIV
Those who do not see a clear example of hypocrisy just don't understand what it is.
Basically, James' point was for believers to live out their faith, so others can see it. Which is clearly seen in 2:18.
But someone will say, "You have faith; I have deeds. Show me your faith without deeds, and I will show you my faith by what I do." NIV
I will point out that I moved the quote mark to the end of the verse. It is placed after "deeds" in most translations. But that doesn't make sense, given what the "someone" says. He SAYS "I have deeds". So to challenge that "someone" to "show me your faith without deeds" is silly. Further, that "someone" says "you have faith" in contrast to his having deeds. So the challenge to "show me your faith without deeds" makes sense for the "someone" to say.