Islams indoctrination process is to show themselves equal or superior to Christianity. It isn't true, but they get a lot of help from the lies of different sects. Not every denomination in Christianity is real or present a factual story. Catholics for instance claimed they gave the New Testament in or following 382ad in a series of synods and councils. 350 years after Christ. It isn't harmless to make such claims.
Islam uses this to claim the Quran has equal or better attestation, about 200 years after Muhammed vs 350 years for Christ. It isn't true.
Scripture was not given through the Catholics after 382 by Roman gentile councils? They simply voted to confirm the books for a new Christian Roman government. The church at large possessed the scriptures by 100ad, Gospels and Acts and letters by 65ad. Is Islam using the Catholic deception to support the Quran and discredit Christianity? Yes.
You see, the Gospels were written in the 1st century, at least 3 were completed by 63ad, possibly all. That is within 30 years of Christ's death, and all scripture completed within 65 years of Christ's death. So the difference in time isn't the 200 to 350 years claimed by Islam, but 200 to 30 years. You see how that matters?
Rome didn't give scripture in 382 and following. It was long accepted in normal churches. The church in Rome had the muratorian canon before 175ad, since they wrote about it in 175. Yet, the Gentiles didn't give scripture, they received them.
Romans 3:2 reveals
unto the Jews were committed to the oracles of God
It wasn't the gentile church that produced and kept scripture, but the Jewish.
Matthew
Mark
Luke
John
Paul
James
Peter
Jude
All writers of the New Testament were Jewish. The New Testament was confirmed by Jesus himself with miracles.
Mark 16:20
And they went forth, and preached every where, the Lord working with [them,] and confirming the word with signs following. Amen.
The gentile councils didn't have anything to do with when scripture was given and confirmed. So Islam uses the catholic narrative, which is a deception, to discredit all Christianity. So, Catholics supported the rise of Islam and still do. They make the Islamic message seem equal or superior.
For the most part Islam refutes Catholic theology, but are way less able to dialogue with others.