We know that they did not do that part of God's will (believing in Christ) by the simple fact Christ is turning them away.
Amen! They
did not believe in the Son unto salvation (John 6:40) and Jesus
NEVER knew them. (Matthew 7:23)
But the specific part of God's will that they did not do is
obey Christ's words.
The Father's will includes more than just believing in Christ:
"23 And this is his command: to believe in the name of his Son, Jesus Christ, and to love one another as he commanded us." - 1 John 3:23
"3 God’s will is for you to be holy, so stay away from all sexual sin." - 1 Thessalonians 4:3
"14 Make every effort to live in peace with everyone and to be holy; without holiness no one will see the Lord." - Hebrews 12:14
There is a difference between doing God's will IN ORDER TO BECOME SAVED (John 6:40) - *notice that "believes in Him" is "apart from additions or modifications."
AND doing God's will AFTER WE HAVE BEEN SAVED. Believers do not love one another in order to become saved but BECAUSE THEY ARE ALREADY SAVED. (1 John 3:10; 4:7-8) Here is more of God's will for believers AFTER THEY HAVE BEEN SAVED.
1 Thessalonians 5:14 - Now
we exhort you, brethren, warn those who are unruly, comfort the fainthearted, uphold the weak, be patient with all. 15 See that no one renders evil for evil to anyone, but always pursue what is good both for yourselves and for all. 16 Rejoice always, 17 pray without ceasing, 18 in everything give thanks; for
this is the will of God in Christ Jesus for you.
God's will for believers in 1 Thessalonians 4:3-7 is in regards to our ongoing sanctification
AFTER WE HAVE BEEN SAVED.
In regards to Hebrews 12:14, the NASB reads - Pursue peace with all men, and the
sanctification without which no one will see the Lord. Without justification, there is no sanctification. Our ongoing sanctification has no bearing on our justification. That is, even if we don't reach entire sanctification/sinless perfection in this lifetime (which we won't) we are still justified by faith in Christ. (Romans 5:1)
What you are dangerously close to doing with these passages of scripture is turn salvation through faith into "type 2 works salvation" that goes something like this, "In addition to placing our faith in Jesus Christ for salvation, if we don't sufficiently love one another, don't sufficiently abstain from sexual sin and don't live "holy enough" lives, then we won't be saved." Then based on your standards, you can draw your line in the sand wherever you like. Christians are not sinless and perfect and will certainly have their struggles right out of the starting gate. We start out as babes in Christ and progress towards maturity in Christ over time. If we are truly born of God then we will grow in the Lord (some faster than others) and we will produce fruit (some more than others.
That is the important message of the passage.
But osas ignores this important part of God's will talked about in the passage, and in so doing gives false comfort to works-less osas adherents that somehow their works-less lives don't matter because they have already fulfilled the whole will of God when they (supposedly) believed in Jesus and that they can't lose their salvation no matter what. They don't know that if all they have is a confession of faith and no works that they don't really believe to salvation. As we see from the passages I posted above believing in Jesus, alone, does not fulfill the whole will of God spoken about in the passage.
This is a straw man argument and you are confusing God's will for us to become saved with God's will for after we have been saved. You are also flirting with type 2 works salvation. This is the bad fruit of nosas.
"
17 faith by itself,
if it is not accompanied by action, is dead (unable to save, see vs.14)." - James 2:17
In James 2:14, we read of one who says/claims he has faith but has no works (to evidence his claim). That is not genuine faith, but a bare profession of faith. So when James asks, "Can that faith save him?" he is saying nothing against genuine faith, but only against an empty profession of faith/dead faith. *So James does not teach that we are saved "by" works. His concern is to show the reality of the faith professed by the individual (James 2:18) and demonstrate that the faith claimed (James 2:14) by the individual is genuine. Simple! *So James is simply saying faith that is not accompanied by evidential works is dead. Again, if someone says-claims he has faith but lacks resulting evidential works, then he has an empty profession of faith/dead faith and not authentic faith. 