If that were true, why does the Bible say in 1 Tim 3:15 that the Church (not the Bible) is the pillar and foundation of truth?
If that were true, why didn’t the books in the New Testament get picked until 400 AD (by Catholic bishops, no less)?
If that were true, why are there so many conflicting Protestant beliefs when there’s only one Bible and one Spirit supposedly interpreting it (and why do they not agree with the original Christian Church on so many points)?
If that were true, why did Jesus come when only one person in ten could read? Seems odd to give us a book for ten percent of the population.
If that were true, why didn’t Jesus himself write anything?
The Bible is critical to our salvation. It’s absolutely necessary and it’s irreplaceable. But it’s not everything we need. We also need the living authority of the Church to interpret and fully benefit from the Bible (called Tradition). Without this authority (on earth) then everyone becomes their own, well, pope.
Martin Luther wrote after the Reformation (and after the Lutherans split into Calvinists and so on and so forth) that “There are as many theologies as there are heads.” What a curious thing for Martin Luther to say. It seems he didn’t want everyone to follow their own interpretation of the Bible; he wanted them to follow his interpretation!
The Bible alone is like the Constitution alone. If each of us could interpret the US Constitution on our own, we would have anarchy. What do we have? An authoritative body (Supreme Court) to interpret the document. The Supreme Court interprets the Constitution to prevent everyone from abusing it and interpreting it for their own gain.
The Church is the same way. The Church, according to the Bible, is the “Pillar and Foundation of truth”. Which Church? The original Church that determined the tradition that determined the books in the Bible. Which Church is that?
The Catholic Church.