But your universal predetermination means all merit is God, not man. Your use of Scripture implies not merit but God's indiscriminate pleasure.Of course it is. Merited salvation is no salvation at all...
14 What shall we say then? Is there injustice on God's part? By no means! 15 For he says to Moses, I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion.
What else do you want to judge God on?
Romans 9 does not speak against libertarianism but against fighting God's predeterminative intervention. People try to buck against their lot in God's history. God intervenes in history to cause it to go His way but not universally to the extent there is no libertarian will, especially concerning salvation.
Salvation is **because** ie libertarianly of faith.
Romans 9:32 (KJV) Wherefore? *Because* they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;
Limited Predetermination is elaborated in Isaiah 10 where the Assyrians buck against God's predetermination ie the axe bucks against the Hand that wields it. God called them to punish the Israelites and they did so but then became proud and went beyond it, so God punished them back in line.
Isaiah 10:5-7, 15-16 (KJV)
5 O Assyrian, the rod of mine anger, and the staff in their hand is mine indignation.
--God predetermines Assyria to punish Israel:
6 I will send him against an hypocritical nation, and against the people of my wrath will I give him a charge, to take the spoil, and to take the prey, and to tread them down like the mire of the streets.
--Assyria has other intentions:
7 Howbeit he meaneth not so, neither doth his heart think so; but it is in his heart to destroy and cut off nations not a few.
--God accuses Assyria of bucking (libertarianly) against the Hand that wields the axe:
15 Shall the axe boast itself against him that heweth therewith? or shall the saw magnify itself against him that shaketh it? as if the rod should shake itself against them that lift it up, or as if the staff should lift up itself, as if it were no wood.
--God punishes them maintaining His predetermination by force:
16 Therefore shall the Lord, the Lord of hosts, send among his fat ones leanness; and under his glory he shall kindle a burning like the burning of a fire.
Thus you are Scripturally in error.