The events in Genesis were written down by Moses. Did he receive these in writing? If not how can we know that the oral telling were not changed over time? How can we trust them? We can trust them because in cultures that rely on oral transmission of their sacred doctrines the exact telling is most painstakingly preserved so as to not corrupt the teachings.
Remember 2 Thessalonians 2:15 “So then, brothers, stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter”
What was taught by the Apostles is to be held firm no matter the instrument of the teaching. Those that followed the Apostles followed this admonishment and it is from this we have the Apostolic Tradition of the Church.
You like many others try to put a contemporary mind on that of an early Christian. It does not make sense. You may have no trust in oral teachings they did not hold to that view. Remember they did not have the tools of mass communication we have now and they had to deal with a populace that did not have access to written materials.
Not only did they not have the tools, but most were illiterate, anyway.
In this time of instant, global communication we simply forget that illiteracy was the state of the common man for many centuries.
It would have been most awkward for anyone to tote a hand-scripted Bible to church on Sunday, let alone being able to read it—such was the case until the phasing out of the feudal system, and the arrival of the printing press.
They haven't changed since they were put in writing.
Remember 2 Thessalonians 2:15 “So then, brothers, stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter”
And just what were the oral traditions that you are sure THEY received that were passed down? We have the NT epistles for the letters part.
If what has been written down is suspect, everything the RCC claims as oral tradition is more so.
Then we're at the place where nothing is sure and we might as well throw the whole thing out.
Remember they did not have the tools of mass communication we have now and they had to deal with a populace that did not have access to written materials.
Except the letters they wrote.....
Colossians 4:16And when this letter has been read among you, have it also read in the church of the Laodiceans; and see that you also read the letter from Laodicea.
1 Thessalonians 5:27 I put you under oath before the Lord to have this letter read to all the brothers.
Ephesians 3:3-5 4 When you read this, you can perceive my insight into the mystery of Christ, 5which was not made known to the sons of men in other generations as it has now been revealed to his holy apostles and prophets by the Spirit.
They were not illiterate and not without materials to read. Letters were written to others and used as a form of communication in those days.
The only use *Holy Tradition* has is to authenticate doctrine or teachings which have no support from Scripture.
The Jews recognizes the OT as Scripture long before it was canonized. Jesus called it Scripture and quoted from a great deal of the books in reference to Himself. His teachings validate the OT.
If that's not good enough, then nothing is.