What you say about justification by faith is not accurate. To begin with, the idea is not restricted to the NT. We find evidence of such 'justification' in the Torah and Prophets. Take, for example, Habbakuk 2:4, which says, 'the just shall live by his faith'. There is no mention here of 'works'.
What James teaches is that faith cannot be considered as faith unless there is outward evidence to demonstrate that faith exists. These are called 'works of faith' or 'works that follow faith'. Such works should not be confused with 'works' that mean 'doing the law'.
If you fail to appreciate the place that faith plays in the scriptures as a whole, it's not surprising that you reject so much of scripture!
You seem to conflate the works of Abraham or Noah, with keeping or not keeping the law. Transgression of the Law is sin. One must first repent, turn away from sin, and then produce good fruit, which are works of faith, such as throwing a mountain into the sea, with the faith of a mustard seed. Two separate entities.
Habbakuk 2:4 is about the righteous will live by his faith/faithfulness. It is about Habbakuk crying for help because he has to look on iniquity, destruction and violence, therefore the "law" is ignored and justice is never upheld, and the wicked surround the righteous, and justice comes out perverted. Somewhat like in today's lawless "Christian" dominated society, where the "law" is now ignored (Isaiah 5:18-20). The righteous believe that "the God of my salvation (YHWH)" will save them at the "appointed time", and Habbakuk's vision from God, lays out the downfall of the wicked. The narrative presented was at the time when the "Chaldeans"/Persians (southern Persia), the head of the beast of the coming day (Revelation 17), were about to chastise the "proud one" who would be the king of Babylon. The scenario happens time and time again, for Judah would continue to break God's laws, and look to idols, such as gods (Habakkuk 2:18-20) made in gold, silver, and wood, such as your Trinity (multiple god) crosses, which cannot speak or hear.
The "appropriate time", with respect to the "end of the age", according to Joel 2:31 -Joel 3-2, would be called the day of the LORD, when there will be "survivors" from Mount Zion and Jerusalem. That time, when all the nations will be judged (Daniel 2:45) is at the door (Matthew 24). Until that time, apparently people will call evil good, and good evil (Isaiah 5:20), and substitute darkness for light.
Keeping the law is line with the faith that God gave it to Israel to follow. On the other hand, "every person" is under the rule to keep the Commandments (Ecclesiastes 12:10). On the other hand, good fruit is required as well as turning from lawlessness/wickedness, or one is cut down and thrown into the fire (Matthew 3), whether they think they have been grafted in or not. People will be judged by their deeds (Revelation 20:12), not according to whatever they think or feel.