Romans 3:22 — Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference.
We are justified, not just by faith in God, but by faith in Jesus Christ specifically.
God's righteousness is provided to all but only applied to those who believe in Jesus Christ.
There is no difference in need between Jew and Gentle, for all have sinned. There is no difference between how God declares all men sinners and how He declares all righteous in Jesus Christ.
Faith of Jesus Christ = the faithfulness of Jesus Christ.