James 2:14-26
What good is it, dear brothers and sisters, if you say you have faith but don’t show it by your actions? Can that kind of faith save anyone? Suppose you see a brother or sister who has no food or clothing, and you say, “Good-bye and have a good day; stay warm and eat well”—but then you don’t give that person any food or clothing. What good does that do?

So you see, faith by itself isn’t enough. Unless it produces good deeds, it is dead and useless.

Now someone may argue, “Some people have faith; others have good deeds.” But I say, “How can you show me your faith if you don’t have good deeds? I will show you my faith by my good deeds.”

You say you have faith, for you believe that there is one God. Good for you! Even the demons believe this, and they tremble in terror. How foolish! Can’t you see that faith without good deeds is useless?

Don’t you remember that our ancestor Abraham was shown to be right with God by his actions when he offered his son Isaac on the altar? You see, his faith and his actions worked together. His actions made his faith complete. And so it happened just as the Scriptures say: “Abraham believed God, and God counted him as righteous because of his faith.” He was even called the friend of God. So you see, we are shown to be right with God by what we do, not by faith alone.

Rahab the prostitute is another example. She was shown to be right with God by her actions when she hid those messengers and sent them safely away by a different road. Just as the body is dead without breath, so also faith is dead without good works.

This is not saying that good works get you to heaven.
Ephesians 2:8-9
For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast.

Yes, we as Christians are called to serve Christ, and that does mean we will do good works. But this doesn’t mean that its a requirement for salvation alone. What the verses in James is talking about is, that when you are walking with God and trying to emulate Him (As being a Christian means we are to emulate Christ) We will be doing good works. What James is talking about is, that True faith will result in good works. Good works as a Christian is the effect of true faith in God.

Its cause and effect. The cause is true faith in God. And the effect is the fruit of the spirit (good works)