Lovely to see we agree on some things
As to the last part you are wrong, it's not about works for me. It is precisely because I believe on Jesus that Loving others even happens.
Do you forget that loving one another is connected to the commandments? you can't separate them as Paul said,
Rom 13:8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
Rom 13:9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
Rom 13:10 Love worketh no ill to his neighbour: therefore love is the fulfilling of the law.
Like I said before, loving one another is consistent with Christ's commandment to Christians.
And love forgives 7x70, which is certainly needed in this flawed physical world we live in.
As far as mixing grace with works, you know very well that faith produces works.
No doubt you focus upon physical works, as your understanding on scripture seems always to be physical.
James 2 speaks of works that shows our faith, citing the example of feeding the hungry and clothing the naked.
Now we all know that there are non believers who likewise feed the hungry and cloth the naked. So are we to assume that these non Christians are showing works of faith in spite of rejecting Christ?
What you miss is that scripture is
spiritually discerned, 1Cor 2:14.
Whilst both Christians and non-Christians help the physically needy, Christians do so spiritually as well. And it's these spiritual works that shows our faith.
Who are the hungry spoken of in James 2?
It's the lost, the
spiritually hungry who lack Christ, our spiritual food.
1Cor 10:3,4
all ate the same spiritual food, and all drank the same spiritual drink. For they drank of that spiritual Rock that followed them, and that Rock was Christ.
And who are the naked in James 2?
It's the lost, the
spiritually naked who lack the robes of righteousness.
Isa 61:10
I will greatly rejoice in the Lord,
My soul shall be joyful in my God;
For He has clothed me with the garments of salvation,
He has covered me with the robe of righteousness,
Our works are to believe on Jesus, John 6:29.
And in believing on Jesus we let our light (Christ in us) shine, preaching the gospel to the lost (the spiritually hungry and naked).
Matt 5:14-16
You are the light of the world. A city that is set on a hill cannot be hidden. Nor do they light a lamp and put it under a basket, but on a lampstand, and it gives light to all who are in the house. Let your light so shine before men, that they may see your good works (believing on Jesus) and glorify your Father in heaven.
Forget about the law for a second.
Love does not kill,
Love does not steal,
Love does not bear false witness,
Love does not dishonor mother and father,
Love does not commit adultery,
Love does not covet those things it should not.
Love does not have other Gods before God,
Love does not take the name of the Lord in vain,
Love does not worship Idols,
Or do you thing love does kill, steal, commit adultery, etc?
If you believe that love does not do those things then you acknowledge that Love keeps/fulfills the law.
If you don't believe that love does not do those things then you make love sinful.
So which is it?
I see it very differently to the scenario you present.
Whilst we agree that love does no ill to another, and that Christians will be a different stages of growth, I do not accuse weaker brethren of "unbelief" should they slip up. Nor do I accuse them of "being in the flesh" and thinking "the cross is not sufficient" because they don't keep the Sabbath.
In fact the Sabbath is not even listed in Christ's 2 commandments.
And Col 2:16 claims that we do not judge anyone about the Sabbath.
The physical is not perfect. What you seem to forget is that the physical is already
dead (by faith, crucified with Christ, Rom 6:6)
because of sin, Rom 8:10.
God is spiritual.
Christians are spiritual (1Cor 2:15, 1Cor 14:37, Gal 6:1)
The law is spiritual (Rom 7:14).
You wrongly look to physical perfection, or being perfected by the flesh. You obsess over the physical Sabbath, accusing anyone who fails perfect physical obedience of being in unbelief.
But Christians keep the spiritual law. And being spiritual we look forward to God's (spiritual) Sabbath, Heb 4. We keep the spiritual law.