It doesn’t? It certainly does and thus the NT contains about 250 references to the OT and about 600 allusions by one count
It certainly does not, in the context that you previously applied. Obviously the Early Christians had the Old Testament and a culture to share. But that was not your point. Your point was that the Early Christian Catholic Church had to assent to the Jewish elders but dissented and thus they somehow in a twist of failed logic are thus not Chirst’s Church.
Your premise is disconnected to your conclusion as it fails to state the full facts of that situation into your original premise. Your omission is that the Jewish religion and the Christian, though connected, are two distinct religions with two completely different sets of beliefs. There is no logical connection, under those full set of facts that would allow your conclusion.
Incorrect: my premise is connected to my conclusion, which is that the means for determining Truth did not suddenly change with the institution of the church, but if it was according to the Roman model which you affirmed, then an infallible magisterium would have been necessary to establish both men and writings as being of God, with those it rejects being rejected.
And under which model 1st c. souls should have rejected Christ and the church - as you must today with those whom Rome rejects - as it began in dissent from the magisterium.
Your omission is that the Jewish religion and the Christian, though connected, are two distinct religions with two completely different sets of beliefs. There is no logical connection, under those full set of facts that would allow your conclusion.
That is simply not the case. As said, the means for determining Truth did not change, and it never required an infallible magisterium which sets Rome apart from Truth being established upon the weight of Scriptural substantiation.
As far as the OT Jewish (not in today's form) and the Christian religion being two completely different sets of beliefs, that is frankly absurd.
In contrast to Islam ( which Rome has worshiping the same God as Catholics), in Christianity it is the same God that every saved Israelite believed in, though supremely revealed in Christ as God manifest in the flesh,
and which men all faced the same need for redemption because of breaking the same thing, that being the law of God, though under Moses this included the ceremonial and civil laws,
and which redemption was by the same means, that of the blood atonement, of which Christ was the perfect and final one,
with the forgiveness received the same way, that being by faith in the mercy of God and His atonement, out of a broken heart and a contrite spirit, (Ps. 34:18) although in Christ the Spirit is poured out upon all flesh that believe, not simply a few.
And which initially is declared the same way, that being by an outward mark.
And which results in the same thing, that being obedience to the word of God, with writings which were est. as Scripture being the transcendent material standard for obedience and testing truth claims.
And thus both looked forward to the coming of the Messiah and the new covenant, but which Christians realize has come in but will come again. Both upheld that which is in "the law of Moses, and in the prophets, and in the psalms" (Lk. 24:44) as the word of God and and as telling of Christ, with true Jews believing that Jesus was the Christ, and out of which faith further additions to Scripture flowed, but in conflation and complementarity to that which was prior est., and which additions the Jewish faith provided precedent for.
And while Christians are no longer under the ceremonial law, disobedience to the moral law is still sin, and by the Spirit they are to fulfill the righteousness of the law. (Rm. 8:4)
Briefly, a Jew who comes to Christ has seen the Father whom he worshiped, in finds in Christ the perfect atonement which the bull blood of bulls and goats pointed to. He finds in the church the Temple of God, "an habitation of God through the Spirit " (Eph. 2:21,22) which the Old Testament Temple pointed to.
And he partakes in a communal meal, in communion with His God and each other. Any he prays to the same triune God, though veiled in the Old Testament, "having boldness to enter into the holiest by the blood of Jesus." (Heb. 10:19)
It is true however, that the New Testament church no longer has a separate class for clergy titled "priests" and uniquely offering sacrifices for sins, yet all believers are priests.
There are other things of both contrast, yet seen by way of fulfillment, as well as sameness, and which altogether is in contrast to a converted Jew changing from a religion with a completely different sets of beliefs to another.
And the principle under which truth was est. remains.