The Bible teaches salvation by an OBEDIENT faith, a faith that obeys the will of God justifies/saves whereby a faith that is void of obedient works is dead as James says.
Faith onlyists try and save man by having man do nothing, that is, salvation is by some thought process or some emotional feeling or acknowledging or 'trusting' in some historical facts about Christ while not doing as Christ says to do, (Lk 6:46 cf Mt 7:21 "doing the will of the Father"). They wrongly think obedience to God's will is a work of merit then wrongly think one's obedience is attempting to earn God's free gift when again, obedience and works of merit are two completely different things and obedience to God's will is not a work of merit.
The Bible teaches salvation by faith, not works (Romans 4:5-6; Ephesians 2:8,9) and obedience which "follows" saving faith in Christ "is" works. Yet you teach salvation by faith AND works in contradiction to scripture. (Romans 3:24-28; 4:2-6; 5:1; 11:6; Ephesians 2:8,9; Titus 3:5; 2 Timothy 1:9 etc..). God's will for us to become saved is found in John 6:40 - For
my Father’s will is that everyone who looks to the Son and
believes in him shall have eternal life, and I will raise them up at the last day.
In regards to "faith without works is dead" in James 2:20, this does not mean that faith is dead until it produces works and then it becomes a living faith or that works are the source of life in faith or that we are saved by works. James is simply saying
faith that is not accompanied by evidential works demonstrates that it's dead. If someone merely
says-claims they have faith, yet
lack resulting evidential works, (James 2:14) then they
demonstrate that they have an
empty profession of faith/dead faith and not authentic faith.
*You have the tail wagging the dog. The cart before the horse.*
Man is saved through faith and not by works (Ephesians 2:8,9; Titus 3:5; 2 Timothy 1:9); yet genuine faith is substantiated, evidenced by works. (James 2:14-24)
Christ saves us through faith based on the merits of His finished work of redemption "alone" and not based on the merits of our works. It is through faith "in Christ alone" (and not based on the merits of our works) that we are justified on account of Christ (Romans 3:24; 5:1; 5:9); yet the faith that justifies does not remain alone (unfruitful, barren) if it is genuine. (James 2:14-26). *Perfect Harmony*
There is a difference between a
deeper faith that
trusts exclusively in Jesus Christ for salvation and mere "mental assent" belief in historical facts about Jesus. In James 2:19, we see that the demons believe "mental assent" that "there is one God," but they
do not believe in/have faith in/trust in/reliance in Christ for salvation. In other words, they
do not believe on the Lord Jesus Christ (Acts 16:31)
and are not saved. Their trust and reliance is in Satan (and not in Jesus) as
demonstrated by their rebellion in heaven and continuous evil works.
In regards to Luke 6:46 and Matthew 7:21, seeking salvation by works is neither doing what Jesus says or doing the will of the Father. "Adding works" to the free gift of salvation by grace through faith, not works (Ephesians 2:8,9) is attempting to earn God's free gift. Obedience which "follows" saving faith in Christ would be works of merit if they were the basis or means by which we obtained salvation.
Either you are trusting in Jesus Christ as the ALL-SUFFICIENT means of your salvation or else you are also trusting in works for salvation (at least in part). You can't have it both ways. Salvation by obedience/works which "follows" saving faith in Christ would be works of merit no matter how much you try and sugar coat it.