Romans 11
25"I do not want you to be ignorant of this mystery, brothers, so that you will not be conceited: A hardening in part has come to Israel, until the full number of the Gentiles has come in. 26And so all Israel will be saved, as it is written:
“The Deliverer will come from Zion,
He will remove godlessness from Jacob.
27And this is My covenant with them
when I take away their sins.”
28Regarding the gospel, they are enemies on your account; but regarding election, they are loved on account of the patriarchs. 29For God’s gifts and His call are irrevocable.
30Just as you who formerly disobeyed God have now received mercy through their disobedience, 31so they too have now disobeyed, in order that they too may now receive mercy through the mercy shown to you. 32For God has consigned all men to disobedience, so that He may have mercy on them all."
You gave no explanation of why you posted Rom 11, but, since that is usually where the mid-Acts Dispnsationalists live, I assume that's your purpose. In any case, Rom 11 is meaningless as proof that the Assembly (so-called church) started in Ac 9. Why, because, in Acts, Israel was preached to as much after Rom 11 was written, during the last of Acts, as it was before.
Romans was written about the time of Acts 20. Nothing changed after this partial hardening. Paul kept going to the Jew first .As late as Ac 28:3-9, Paul was still performing healing and miracles. In Ac 28:20, he says, in Rome, that, for the hope of Israel, he is bound with chains. Then, at the end of Acts 28, he spends the whole day witnessing to Israel (Pharisees). The ONLY purpose of the Gentiles being part of this, since Ac 10, was to provoke Israel to Jealousy, so Israel might convert as a nation. Every Gentile that was saved during Acts became part of Israel, through the figure of grafting into an olive tree. The Gentiles had NOTHING of their own, during the entirety of Acts. The end of Acts was the same as the beginning of Acts - trying to convert Israel to accept Christ, so Christ would return and Israel's Kingdom of Heaven would enter in. Nothing worked. Therefore, in Ac 28:28, the salvation of God was taken from Israel and given to the Gentiles. Israel was set aside and does not exist as a nation today, in God's eyes. Also, all the gifts (including healing, withstanding serpent bites, etc.) and everything else belonging to Israel was set aside in Ac 28:28.
ALL of Acts was Israel, from the upper room, where only Jew were present, to the end of Acts 28, where Paul was still going to the Jew first. After Acts, it's the total opposite. It's now ALL Gentiles. The Jews are just a passing thought. Fake Jews falsely in the land, due to a fake fulfillment of prophecy. The proof that Acts 28:28 is the dividing line that we're supposed to rightly divide as per 2Tim 2:15, is that it's the only point since Gen 12 where there's pure Israel on one side and pure Gentiles on the other. The other 2 points that dispensationalists use, Ac 2 and Ac 9 or 13, are fake because, in both, ALL Israel exists on both sides of these phony dividing lines.
One second before Paul pronounced Ac 28:28 to those Pharisees, it was 100% Israel in God's eyes, just like it had been for 2000 years before that. One second after, it's 100% Gentiles in God's eyes, just like it has been for 2000 years since then. Acts 28:28 is the only place since Abraham in Gen 12 that Israel immediately ceased being #1 and was entirely replaced, as #1, by the Gentiles.Therefore, it the only place that needs to be rightly divided = correctly cut, as per 2Tim 2:15. If we don't correctly cut it and remove the rules and directions found in the Israel part, we will find contradictions and will easily become confused, as about 99+% of Christendom experiences whenever they open their Bible. God isn't the author of confusion - people are. If we rightly divide, correctly cut the scriptures, according to 2Tim 2:15. we are approved unto God and we need not be ashamed. So, assuming that's true, the reverse must also be true. If we DON'T correctly cut God's Word. we ARE NOT approved unto God and we MUST feel ashamed.
2Tim 2:15
"Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth."
As an Acts 28 dispensationalist for 30 years, I've always known that right division was very important, but recently I've realized that, beyond Jesus Christ and His death, burial, and resurrection, the most important thing to understand and perform is Right Division. I know this sounds terrible but, if you DON'T rightly divide,
your knowledge of your calling, your hope, your rules, and your specific directions,
is ZERO. Without right division, you know nothing concerning yourself that is true beyond your salvation. Maybe, for many, just knowing Christ is enough. However, If you want to know what YOU can expect in the afterlife, at best, you'll only find it in Paul's last 7 books, those written after the Ac 28:28 dividing line. These are Eph, Phil, Col, 1&2Tim, Titus, and Philemon. These are the only pure Gentile books, the only ones where you'll find that, unlike any other people in the Bible, your afterlife can be in Heaven, where Christ now sits at the right hand of God.. Forget Acts and the Rapture. The "Appearing", found only in Paul's post-Acts books, is far, far better than the Jewish rapture. If you stay in Acts, you're crippled by confusion.
Don't believe the rubbish that every saved person immediately goes to heaven when they die. It's an unfortunate lie kept alive mainly by unknowledgeable denominational preachers. There is absolutely no Biblical proof of this. If it were true, the entire necessity of resurrection would be null and void. Every saved person that has ever died is still asleep in hades, the grave, waiting for the resurrection.