Well, soso.
Is the bible the only writing that is inspired by God? There were other writings around.
The Catholic church claims that their churchmen were in line from Peter to make the selection.
Problem.
But I believe there is God and I believe that the wonderful teaching of Jesus reflects God. And the fact that other teachers from other faith traditions have similar teachings only makes me happy. God draws us everywhere in the same direction.
How to use the bible yourself if you don't have religious rulers to define doctrine and theology? You will have to as Jesus how that works. I cannot see how he delegated a hieracrchy, a governing body.
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A good read for me the other day is the story of Franz Jagerstatter. A man whose reliance on what he understood of Jesus was not backed by his church. The Nazis didn't like him either.
Way to make the truth your own. google search him. It helped me.