I’m have read explanations from the internet before, I forgot them though.
My idea is that, the first church existed before any Bible is created, the Catholic Church is like a living Bible since they are the first church, their knowledge passed on mostly orally since writings can only be written manually to be reproduced before the invention of the printing press.
Also, the Bible we know today didn’t chose itself as true, instead, the church inspected which scriptures are true according to her knowledge and with the help the Holy Spirit. So if you believe the Bible, you indirectly believed the first church without knowing it.
I thought that the Catholic church is nearly as authoritative as the Bible, like Saint Paul, for what I know, he didn’t met Jesus, but why is his teachings part of the Bible? I think it’s because he’s chosen by the church to be an apostle.
What I got to research now is how true that the first church is the Catholic church.
What do you think of this?
Additionally, the Bible followed by the Protestants is based on the Catholic Bible with removed OT books. They should have checked out the Biblical books rejected by the first church if they don’t believe the Catholic church.