In addition to this statement, or an elaboration of it, can someone show in a SCHOLARLY way, with archeological things and literary texts around the same period, that the first five books were written by Moses exclusively? Because the only way you're going to convince a "secular scholar" is by showing evidence, not a faith-claim like "this is the Word of God, so you must believe it."
Please understand, I AM NOT taking one side or the other; I just want to learn.
Heh this a good question, and one I can answer for you that I had answered for me even without asking.
It's actually quite simple. Besides just the 5 books written by Moses or his scribes that collaborates that Moses lived, and wrote or dictated to the Levitical scribes the first five books in the compilation of the Bible, other written works therein of Moses' race speak of Moses also implying his authorship as clearly all of Israel and even secular world history were influenced by his writings. Even the Pharisees and Sadducees, some of the biggest unbelievers in the history of unbelievers, didn't doubt Moses lived and wrote the Torah lol, so when you have people that don't believe in what you wrote, but not doubting your authorship, it's a pretty good bet you actually wrote it regardless wehther what you wrote is right or wrong.
Not only all of that but considering the broad topics the Pentateuch covers this gives even more proof to Moses and his authorship since its not all just a story of Moses, but also ranges on topics many of which are outright confirmed or have enough supporting evidence to safely assume like historical events, warfare, touches on culture/politics/customs of the pagan peoples besides the Israelites. In fact the Mosaic Law which secularly is one of the most ancient known law structures in time which people indeed adhered to and ascribed to its namesake Moses is good proof Moses lived and told his story. The five books touch on race too which is an intriguing topic itself since we haven't been able to prove much of it besides with documentation and common sense until the rise of 20th century genetics proving race is simple family ties and that the race of jews goes back to the 12 tribes and more specifically mighth ave decent proof Moses most unbelievable book Genesis (since it pre-dates Moses) might prove Moses somehow knew quite a bit that the jewish race goes back to Israel who is Jacob and his four wives.
For me I considerred all those things as an atheist so I still thought Moses was real, I just thought he was a little crazy like all the ancient writers because I never read the entire Bible, I had just read some of the more fantastic and famous elements as an atheist but as a reader but had not read the full story (famous stuff meaning like the 10 plagues, burning bush, basically the stuff in the movie 10 Commandments lol). So gotta keep in mind that's the kinda atheist I was, I just didn't know, but was trying to know. I can't speak for all self-proclaimed atheists former or current, but that was my view of it later on after I was just done being a dumb teenager when I didn't care either which way lol.
Then I read all the 5 books plus the Bible as a whole and Moses comes off as quite intelligent to me, but very meek and humble just as he is described. It's all like the pieces fit together much better when you look at the puzzle more fully. I think for most atheists who are little more intellectual in terms of wanting to know, like myself when I was one, its not so hard for them to accept that Moses was a real guy if they are at least a little versed in secular history and even a lot of what Moses did is pretty confirmable and certain.
I think of course most atheists have a hard time accepting the God Moses says he encountered in his life. This is sort of ironic because even the non-jewish people of Moses' time and well afterwards until the 1800s AD never questioned that a god helped Moses. Some were just unsure that it is The God, like Pharoah was unsure, or due to the much idol worship of that time worshipped dead figurines like Ra and Horus and hearkened to the Magicians to no avail when down came the plague of hail.
However with knowing the Bible in full we can even give much better confirmation of indeed God being the God of Moses with later writers, God's prophets, and of course Jesus best of all confirms He is the one who was with Moses.