James Chapter 2 Verses17-21...

17 In the same way, faith also, if it has no works, is dead, being by itself.

18 But someone may well say, “You have faith and I have works; show me your faith without the works, and I will show you my faith by my works.” 19 You believe that God is one. You do well; the demons also believe, and shudder. 20 But are you willing to acknowledge, you foolish person, that faith without works is useless? 21 Was our father Abraham not justified by works when he offered up his son Isaac on the altar? 

Verse 17:

Faith without works is dead (by itself).

6 For in Christ Jesus neither circumcision nor uncircumcision means anything, but faith working through love. Galatians 5:6

Verse 18: 

Any believer is someone.

Any believer can pretend to have faith or say they have faith by faith of history.

Any believer can boast they have works and say nothing about their faith.

We have to take action to profess we have faith without it we are pretending we have faith.

If faith is evident there will be works to prove we have true faith.

19 You will say to me then, “Why does He still find fault? For who has resisted His will?” Romans 9:19

Verse 19:

This verse talks about believing in one God and that He is that one God.

Even the demons also believe the same as the believers and fear God.

4 “Hear, Israel! The Lord is our God, the Lord is one! Deuteronomy 6:4

Verse 20:

This verse is talking about a fool if he is willing to recognize faith without works is useless. 

20 On the contrary, who are you, you foolish person, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it? Romans 9:20

Verse 21:

His faith in God and righteousness was his justification.

He did not actually go through with Issac on the alter it was the act of him trying to go through with it.

This was implied because God never actually made Abraham do it.

9 Then they came to the place of which God had told him; and Abraham built the altar there and arranged the wood, and bound his son Isaac and laid him on the altar, on top of the wood. Genesis 22:9