“and the fact they’ve been faithful on that point”
You realize that you cannot prove this theory, right? Therefore it isn’t a fact. You simply assume they have been faithful since Moses.
Ultimately, by your arguement, nothing can be proven historically, so nothing is valid.
Absolutely nothing.
Prove to me God exists. You can’t, therefore He doesn’t exist. If God doesn’t exist, you don’t need to obey the Bible in anyway. It’s a freeforall.
That is the essence of your arguement. If it cannot be proven, it doesn’t exist.