Again, your “faith alone” quote is twisted.
Martin Luther, and the King James Bible, both did a terrible job on that particular verse, and they did an even worse job in the interpretation of their poorly translated version.
Martin Luther decided what he wanted, and then wrote a Bible to support his views.
NIV:
Galatians 2:16
know that a man is not justified by observing the law, but by faith in Jesus Christ. So we, too, have put our faith in Christ Jesus that we may be justified by faith in Christ and not by observing the law, because by observing the law no one will be justified.
KJV:
Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
Galatians 2:16 (Douay-Rheims 1899 American Edition)
16But knowing that man is not justified by the works of the law, but by the faith of Jesus Christ; we also believe in Christ Jesus, that we may be justified by the faith of Christ, and not by the works of the law: because by the works of the law no flesh shall be justified.