You are welcome at the Catholic Church.
There You can have the whole story.
How did Jesus teach us - by oral tradition - by example, by preaching and by discussing with His Apostles.
The Apostles continued this oral tradition of preaching, talking with people and example. This was passed on to their successors and to the public.
Even today there are readings from the Bible at every Mass and in the sacraments, preached from the pulpit and in talks or meetings with bishops, priests, nuns and lay persons.
So you can have the whole story.
Jesus is God with Us. His Spirit is author of not just the Universe (John 1:) but the Old and New Testament. He is The Word made flesh Who dwelt among us. He used the Apostles and other inspired letter writers to issue the New Testament for our instruction. But if you don’t believe The Spirit of God is the actual author of the New Testament, well then it will be difficult to get any further in discussion. The Spirit of God is raising up His children int he way that they should go, by the direct indwelling of His Spirit. His Spirit is able to cause The Truth of what The Word of God (the Bible) declares to grow His nature in you and me. So Jesus continues to teach and work in us via His Words, regardless of whom it is that wrote them down.
1 peter 2:5 you yourselves like living stones are being built up as a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ.
So what should I believe, the oral tradition handed down, or the very words written by Peter?
I like to zero in on details...
Pope Stephen VI (896–897), who had his predecessor Pope Formosus exhumed, tried, de-fingered, briefly reburied, and thrown in the Tiber.[1]
Pope John XII (955–964), who gave land to a mistress, murdered several people, and was killed by a man who caught him in bed with his wife.
Pope Benedict IX (1032–1044, 1045, 1047–1048), who "sold" the Papacy
Pope Boniface VIII (1294–1303), who is lampooned in Dante's Divine Comedy
Pope Urban VI (1378–1389), who complained that he did not hear enough screaming when Cardinals who had conspired against him were tortured.[2]
Pope Alexander VI (1492–1503), a Borgia, who was guilty of nepotism and whose unattended corpse swelled until it could barely fit in a coffin.[3]
Pope Leo X (1513–1521), a spendthrift member of the Medici family who once spent 1/7 of his predecessors' reserves on a single ceremony[4]
Pope Clement VII (1523–1534), also a Medici, whose power-politicking with France, Spain, and Germany got Rome sacked.