God does not show favoritism

Romans 2:6-11
God “will repay each person according to what they have done.”
To those who by persistence in doing good seek glory, honor and immortality, he will give eternal life. 
But for those who are self-seeking and who reject the truth and follow evil, there will be wrath and anger. 
Sequence of judgment of God: first for the Jew, then for the Gentile. 
For God does not show favoritism. He judges all by the same standard.
Why?
Judgment is according to what a man have done, it is not according to who you are or your race.
Eternal life will be given to those who persistent in doing good seek glory,honor and immortality.
Trouble, distress and wrath of God will be given to those who reject the truth and follow evil.
God does not show favoritism, the judgment are equal and same to everyone on the world, but will be started from Jews, Christians, then the Gentile.
How?
God is good, who shows not favoritism to people.