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This did not happen for the great many of the Jewish people, who instead denied Christ and were left with rabbinical Judaism.

You have all overlooked an important Scripture.

Lest you be wise in your own conceits, I want you to undrstand this mystery, brethren: a hardening has come upon part of Israel, until the full number of the Gentiles come in.
Rom 11:25

Paul warns the Gentiles not to see their faith as superiority over the Jews.

and so all Israel will be saved, as it is written, "The Deliverer will come from Zion, he will banish ungodliness from Jacob. And this will be my covenant with them when I take away their sins.
Rom 11:26-27

Again, the statement that the unbelief of the Jews was an integral part of God's plan to enable the Gentiles to be saved but that when the "full number" of the Gentiles has come in, the "hardening" resulting in the Jews' unbelief, will be removed and "all Israel will be saved".

In respect to the gospel, they are enemies on your account; but in respect to election, they are beloved because of the patriarchs. For the gifts and the call of God are irrevocable.
Rom 11:28-29

Paul repeats that the Jews' rejection of the Gospel - their refusal to believe in Christ - was for the sake of the Gentiles. Their election, the special love that God has for them, and their special gifts remain.

Just as you once disobeyed God but have now received mercy because of their disobedience, so they have now disobeyed in order that, by virtue of the mercy shown to you, they too may (now) receive mercy. For God delivered all to disobedience, that he might have mercy upon all.
Rom 11:30-32

Once again, St. Paul repeats the assertion that the Jews' disobedience - rejection of the Gospel - was somehow, mysteriously, part of God's plan so that the Gentiles might be saved. He concludes by showing the unfathomable depth, mystery and mercy revealed in God's plan of salvation.

Oh, the depth of the riches and wisdom and knowledge of God! How inscrutable are his judgments and how unsearchable his ways! "For who has known the mind of the Lord or who has been his counselor?" "Or who has given him anything that he may be repaid?" For from him and through him and for him are all things. To him be glory forever. Amen.
Rom 11:33-36

As Rosalind Moss, a well known Jewish convert put it: "becoming Catholic is the most Jewish thing a person can do".

What Bible is your unnamed source quoting from?

From the Douay-Rheims Bible: Romans, Chapter 11

[19] Thou wilt say then: The branches were broken off, that I might be grafted in. [20] Well: because of unbelief they were broken off. But thou standest by faith: be not highminded, but fear.

[20] Thou standest by faith. Be not highminded, but fear: We see here that he who standeth by faith may fall from it; and therefore must live in fear, and not in the vain presumption and security of modern sectaries.

[21] For if God hath not spared the natural branches, fear lest perhaps he also spare not thee. [22] See then the goodness and the severity of God: towards them indeed that are fallen, the severity; but towards thee, the goodness of God, if thou abide in goodness, otherwise thou also shalt be cut off. [23] And they also, if they abide not still in unbelief, shall be grafted in: for God is able to graft them in again. [24] For if thou wert cut out of the wild olive tree, which is natural to thee; and, contrary to nature, were grafted into the good olive tree; how much more shall they that are the natural branches, be grafted into their own olive tree? [25] For I would not have you ignorant, brethren, of this mystery, (lest you should be wise in your own conceits), that blindness in part has happened in Israel, until the fulness of the Gentiles should come in.

[22] Otherwise thou also shalt be cut off: The Gentiles are here admonished not to be proud, nor to glory against the Jews: but to take occasion rather from their fall to fear and to be humble, lest they be cast off. Not that the whole church of Christ can ever fall from him; having been secured by so many divine promises in holy writ; but that each one in particular may fall; and therefore all in general are to be admonished to beware of that, which may happen to any one in particular.

All I said is the observable fact that great many Jews denied and continue to deny Christ; so therefore any kind of worship in common with them is contrary to the Catholic Christian religion, as well as to their religion. I made no comment on their future conversion or the economy of their salvation; I agree that it is all according to plan.

"becoming Catholic is the most Jewish thing a person can do"

Of course. And she also said (from memory): Catholicism is the true Judaism. So why validate the error of rabbinical Judaism?