Basically, your argument is that God will keep you believing. I can respect that argument. I don't agree with it anymore because of Hebrews 10:29 NASB, but at least it's worthy of examination.
Glad to see you're becoming objective. So, let's examine Romans about what Paul meant when he said that God's gift and call were irrevocable.
Rom 1:5-7
"5Through him and for his name’s sake, we received grace and apostleship
to call people from among all the Gentiles to the obedience that comes from faith. 6And
you also are among those
who are called to belong to Jesus Christ. 7To all in Rome who are loved by God and
called to be saints: Grace and peace to you from God our Father and from the Lord Jesus Christ." NIV
Rom 8:28,30
"28 And we know that in all things God works for the good of those who love him,
who have been called according to his purpose. 30And those he predestined,
he also called; those he called, he also justified; those he justified, he also glorified." NIV
There are no verses about Israel being called anywhere in Scripture. The calling of God is directed at believers, not Israel.
Romans 5:15,17
"15But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God’s grace and
the gift that came by the grace of the one man, Jesus Christ, overflow to the many! 17For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God’s abundant provision of grace and of
the gift of righteousness reign in life through the one man, Jesus Christ." NIV
Romans 6:23
"For the wages of sin is death, but
the gift of God is eternal life in Christ Jesus our Lord." NIV
Paul clearly identified God's gift to believers as being righteousness and eternal life.
Romans 11:29
"29for God’s gifts and his call are irrevocable." NIV
That God's gifts and His call refer to believers is undeniable, given all that he wrote prior to 11:29. He mentioned God's call 5 times, and God's gift 3 times, all before 11:29. And in each verse, the call and gift are for believers.
And…the really good news!! God's gift and call are irrevocable. OSAS is another way to spell it.
So all of your argumentation to the contrary is refuted by these verses.
Irrevocable is irrefutable.