There was never given such power to any organization, as the authority lies in the scriptures themselves, and each saved person has the Holy Spirit illumination!
No, the scriptures are authoritative - authority resides in persons. If what you say had been the case, Jesus would just have written a book and that would have been it, but we know that is not what happened. Jesus instead started a church that would exist here on earth and appointed people to run it with the authority to decide things for the faithful. One of the best examples are the scriptures themselves. They just did not magically appear in book form from the heavens, they were compiled by people (the Bishop's) who were in charge of the Christian Church here on earth. They had to decide which writings (of the hundreds that were out there) that were to be included. Authority and authoritative - two different words with two different meanings.
Now, it's long past time that you come out of your fantasy world concerning the Christian experience and learn to accept the truth as evidenced by the complete historical record.