Over and over the Bible says God shows no partiality. Yes, He elected Israel and gave them His Word first, but thankfully the door is now wide open to every nation.
Here is why: all sin and fall short.
All. Everyone. Every country. Every nation. Sin rules the Jew and the Gentile. Sin enslaves the young or old. Sin destroys the rich or poor. Sin is the great equalizer of nations. Sin is the common denominator in all our DNA. It is because of the debilitating pervasiveness of sin that God shows no partiality.
You say: “Not me! I try my best to be good. I don’t do anything bad!”
Actually, what you are (if you are without Christ Jesus) is not good or bad; but DEAD. Jesus didn’t come to condemn, but save. Jesus didn’t come to make bad people good or good people better. Jesus came to bring dead people back to life.
God shows no partiality because a dead body is the same as any other dead body and He doesn’t like dead bodies; He likes living ones.
God shows no partiality because of His goodness.
God shows no partiality because the Gospel is for everyone.