Do you honestly believe that God is that weak that He wouldn’t have found another way? Seriously? God uses evil and dishonest people all the time to work His will. Judas would be one example. Catholics trying to take credit for preserving scripture is like Judas taking credit for procuring our salvation.
the truth hurts, there were no protestants and born agains during those times, for the first 1,500 years, the entire Christian world believed in the Body, Blood, Soul and Divinity of Jesus in the Holy Eucharist and exulted Mary, the Mother of God, then came the reformation and it’s been downhill since.
The question is not what could have been—all things are possible with God—but what was and what is. I disagree that we would not have the Bible because the eastern churches also had the Scriptures. Nonetheless, the Irish monks revered the Bible every bit as much as any modern Christian and they shared it with the whole of western Europe.