My main question would be :
If their is / was an Almighty GOD why couldn`t / wouldn` t he preserve the original texts ? After all it is supposedly his word , you would think he would want to preserve it as was accurately portrayed wouldn`t you ?
And not leave it up to imperfect humans who have their own agenda for making their own pet views known.
Ancient Jewish worshipers no doubt had their pet beliefs and being imperfect humans like the rest of us could quite easily modify /manipulate writings to suit their agenda.
Scribes were only imperfect human beings that had their own beliefs and bias `s
It`s no stretch of the imagination that they could influence what we accept today as the Word Of God