Galatians 5:4 You who are trying to be justified by the law have been alienated from Christ; you have fallen away from grace.
Can you grant that this verse is specifically saying that those who are trying to be justified by the law have fallen from grace? Can you also grant that no one in this thread has ever suggested that we need to try to become justified by obeying the law? Can you even point to where the God required obedience to His Law for the purpose of justification? If not, then can you grant that there could be other purpose for which the Law was given?
Titus 2:11-14 For the grace of God has appeared, bringing salvation for all people, 12 training us to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives in the present age, 13 waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ, 14 who gave himself for us to redeem us from all lawlessness and to purify for himself a people for his own possession who are zealous for good works.
Can you grant that God's Law instructs how to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives? Can you also grant that finished work of Christ was to redeem us from all Lawlessness and to purify for himself a people for his own possession who are zealous for good works? And that such good works would not be adding to the finished work of Christ, but would be what the finished work of Christ entails by grace?
Can you grant that the Bible defines sin as the transgression of the Law whereas you've defined sin as obedience to the Law?