Did I say the Christianity was the best religion? No.
I wasn't suggesting you were saying that.
Oral traditions become written ones.
Not always. That happens occasionally, but the problem is that when they do it tends to kill them, as oral traditions are allowed to be tailored to the audience, to evolve, to grow, to change in tenor and flavor through the story tellers.
Anything oral can be written down and mass-printed nowadays.
Much to its demise, I believe. But just because it can, doesn't mean it is.
I just believe for an authentic religion to exist, the person who is the founder should write their own holy book.
Why? I very much question the validity of this. The reality is that most founder figures are the catalyst that inspires faith in others, and it is their evolving faith that creates the founding figure in their own image, or rather in the image of the faith that they inspired in them. What you read in these books is more about those who followed, rather than about the founding figure themselves. The sayings of the Buddha are far too many for him to have written all of them. But they belong to a collection of attributions of students to their teachers. It's the same with Jesus. Did he really say all of what is written he said? Doubtful. Very doubtful. But these collections of attributions becomes the "Jesus said", or the "Buddha said", sayings. In the case of the Gospels, these sayings were woven in and around various narrative stories of the founding figure as a vehicle for the teachings of the Christian community. "Jesus said" is put against a backdrop of "When he met a woman on the road and was taken by her kindness he said........".