Look at you, Renniks, you convey “Why does He still find fault?" (Romans 9:19), but more on this after the next paragraph.
As
@Scott Downey pointed out scripturally in
post #2963, "They don't view scriptures as authoritative for faith and practice.".
You will say to me then, “Why does He still find fault? For who resists His will?” On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it? Or does not the potter have a right over the clay, to make from the same lump one vessel for honorable use and another for common use? What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction? And He did so to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory
(Romans 9:19-23)
Paul just got through declaring God's Sovereign control of man with "He has mercy on whom He desires, and He hardens whom He desires" (Romans 9:18).
Immediately after writing that God is in control Paul continued with "You will say to me then, 'Why does He still find fault? For who resists His will?'” (Romans 9:19)
Romans 9:18 segues right into Romans 9:19-23.
Bringing these together:
Paul conveyed "God is in control" (Romans 9:18) then the "you" defiantly mocks God's control with "You realize in your theology if people don't believe the scripture it's because God doesn't allow them to, right?" like in Romans 9:19, because your words align so well with the actual Romans 9:19 content).
The "you" in Romans 9:19-20 is the person who rejects God by way of rejecting God's exclusive control of man's salvation; in other words, the "you" is the person that claims man has a free will.
Do not forget that it is written that no purpose of God's can be thwarted (Job 42:2), so scripture reveals that man cannot resist God's will, and Paul knows scripture.
Notice the "you" questioning why God still finds fault. Paul conveys that the "you" asks the fault question in a mocking manner, and the subsequent question about God's will continues with the "you" mocking the One True God who is entirely in control of man's salvation according to Paul (Ephesians 2:8-10 for example).
The "you" mocking is certain because immediately after the question about God's will, Paul wrote:
On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it? (Romans 9:20)
See the "On the contrary" which is indicative that the following statement of Paul refutes the mocking questions of the "you" about fault and about God's will (in Romans 9:19).
Paul continues immediately after "On the contrary" in Romans 9:20 showing that the thing molded cannot resist the will of the Molder.
The thing molded represents the "you".
The Molder represents God.
IN TRUTH, PAUL CONVEYS THAT MAN CANNOT RESIST GOD'S WILL (ROMANS 9:19-20)!
The Truth (John 14:6) is that Lord Jesus Christ died exclusively to save all the vessels of mercy, which He prepared beforehand for glory.