If it were the case that faith causes works then there would be no need to work out our salvation with fear and trembling. There would be no need for James to say we are saved by works and not faith alone. There would be no need for judgement based on what we did or didn't do. If faith causes works then only those with faith could give food to the hungry. Or a drink to the thirsty. It would be impossible for atheists to ever do such things.
It explains quite a but more in that chapter than one verse about there must be works alongside faith. Anyone can go into a church and say the sinners prayer, but what does he do after that? Will he have any works? What works? Why?
Joining the Lord's family is the beginning my friend, it's almost like joining the Service. You signed up and then, you show up and are trained and then do military stuff, the work of it. Our works and good deeds for others is the fruit of wow we can see you are in the service now, it shows. In our military it may be in the Uniform he wears, or in the case of grenades in his garage (Lol)
James 2: 14-26
14 What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him?
15 If a brother or sister be naked, and destitute of daily food,
16 And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit?
17 Even so faith, if it hath not works, is dead, being alone.
18 Yea, a man may say,
Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
20
But wilt thou know, O vain man, that faith without works is dead?
21 Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?
22
Seest thou how faith wrought with his works, and by works was faith made perfect?
23 And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God.
24
Ye see then how that by works a man is justified, and not by faith only.
25 Likewise also was not Rahab the harlot justified by works, when she had received the messengers, and had sent them out another way?
26
For as the body without the spirit is dead, so faith without works is dead also..../KJV
Our works are the proof to God that we are serious about following Him.
Two kinds of Christians said the sinners prayer that day in church. One went home to wait on God to bless him and he sat down on his couch, and made sure to go to church every sunday. I'm saved now.
The other Christian went home and began reading God's word to put him self into the presence of God and He began asking lots of questions and he felt so good that he wanted to please the Lord. The Lord blessed him for it because obedience is rewarded to us from the Lord.