Always and anon, the objection is "Why doth He yet find fault?"
And, for the thousandth time, Paul has already responded, "Who do you think you are, puny human, to judge God?"
First, I would disagree with your interpretation of this verse in Romans 9.
Rom 9:19 Thou wilt say then unto me, Why doth he yet find fault? For who hath resisted his will?
20 Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus?
21 Hath not the potter power over the clay, of the same lump to make one vessel unto honour, and another unto dishonour?
When Paul spoke of the Potter here, he was making reference to Jeremiah 18 where God said that if he has spoken evil toward a nation, if they repent of their sins, he would repent of the evil he intended toward them. Likewise, if there was a nation he had spoken favorably toward, if they turn away from him and sin, then God would turn from the good he intended toward them.
Jer 18:6 O house of Israel, cannot I do with you as this potter? saith the LORD. Behold, as the clay is in the potter's hand, so are ye in mine hand, O house of Israel.
7 At what instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy it;
8 If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them.
9 And at what instant I shall speak concerning a nation, and concerning a kingdom, to build and to plant it;
10 If it do evil in my sight, that it obey not my voice, then I will repent of the good, wherewith I said I would benefit them.
11 Now therefore go to, speak to the men of Judah, and to the inhabitants of Jerusalem, saying, Thus saith the LORD; Behold, I frame evil against you, and devise a device against you: return ye now every one from his evil way, and make your ways and your doings good.
Paul was NOT teaching Unconditional Election as Calvinism claims in Romans 9. He was teaching that God was rejecting the Jews because they had rejected Christ and attempted to save themselves through works, and that he was now accepting the Gentiles because they sought righteousness through faith in Jesus.
Rom 9:30 What shall we say then? That the Gentiles, which followed not after righteousness, have attained to righteousness, even the righteousness which is of faith.
31 But Israel, which followed after the law of righteousness, hath not attained to the law of righteousness.
32 Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;
33 As it is written, Behold, I lay in Sion a stumblingstone and rock of offence: and whosoever believeth on him shall not be ashamed.
God is just, he does not damn people unconditionally, but for wilful unbelief.