No real confusion about the Torah, I was also only referring to the pentateuch as well. The talmud does however discuss who wrote each of the later texts.
> the cohesive narrative of Moses authoring the pentateuch
There is a disagreement in the Talmud about this point.
When you say you read talmud, have you ever studied it in a Yeshiva, while learning the commentary, or just read an english translation of part of it?
I think the point that seems to be lost in this discussion is the following.
Picture a conversation on reddit like this...
redditor1: my opinion is the truth.
redditor2: source?
redditor1: here is the link
redditor2: but three years ago you said this competing theory.
redditor3: those opinions are consistent because of differing circumstances...
redditor4: what this other thing he said that is the same circumstances as the old post but supports the new one.
redditor3: I guess i was wrong. I am stumped.
redditor4: it makes sense because if you look at the sentence structure, they are really the same thing said in two different ways.
Now imagine a conversation like that trying to determine the veracity of every single word in the Torah, every single law and theory mentioned in the talmud and mishna, etc...
Studying the talmud is not some text some guy wrote down. It is an intense and deep analysis that considers math, physics, science,logic, language analysis, etc... all with the goal of finding the truth about the torah and mishna...not to support a theory about G-d giving over the Torah to Moses who than transcribed most of it.
What I am trying to say is that while I don't know the relevant discussions around the pentateuch authorship other than the link I shared earlier from Ohr.com ... These scholars who analyzed the text to determine if there were multiple authors, etc... really need to look at the explanations in the talmud for why one sentence is written one way and another is written another way...
It seems intellectually dishonest to me to analyze these things without consulting the talmudic experts who have studying the relevant sections...As there might be discussion and context that is very relevant.