The Holy Spirit gave us Scripture (2 Peter 1:20-21;2 Timothy 3:16 ), so in a sense, yes, the Bible "fell out of the sky" from Heaven through "holy men of God", not "the Church".
It is through the ordained priesthood that we receive Communion.
More doctrine of man, as Jesus said, ”teaching for doctrines the commandments of men” (Mark 7:7). You cannot show where scripture teaches this man-generated doctrine.
Think about this.
Men wrote it. Men compiled it. Men canonized it. It was human hands which put this book together. Yes, the Holy Spirit inspired them but humans were the proximal means by which this book was assembled. Did the Holy Spirit take a permanent vacation when the job was done? Does he no longer work through the Church and guide it?
Moreover, there was a time in Church history when there was no New Testament. Read Acts 15. When Paul and Barnabas got into a dispute about circumcision in Antioch, they could not say "let's see what the Bible says about this". The New Testament had not been assembled. Instead, Scripture tells us that they returned to Jerusalem to consult with the "Apostles and ancients".
That's how it was in the early Church. It was men who guided it, not a book.