You're absolutely correct in that the original authors were inspired by God to perfectly write as they did, covering human time from about 2,500 BC to about 100 AD.
Sadly, we don't have any originals of those writings, all we have are handwritten copies and translations that do vary a bit. We KNOW there are some word and grammar variations in those works, at least in the translations.
For instance, we know the 1611 KJV has the most specific word errors but it's meaningless, none of those errors have any effect on any Christian doctrine so they don't matter. There are some current English Bible versions I personally like better than others but that doesn't mean my favorites are somehow better or more accurate than the others.
Some folk ask, "Why so many versions of the Bible?" Answer is, any translation of anything is a version of the original; it has to be, if the original remained exactly the same it would not be a translation at all! Since we don't have and can't read the original texts, our concern has to be, "How accurately does the translated version present the original message?" Bottom line, I believe all of the dozen or more versions I have read are all good but probably not perfect.
I mean it seems that all major (orthodox) Bible versions get the spiritual message correct so we accomplish nothing useful by arguing amongst ourselves over which English version is "right" or "wrong"; THAT'S JUST OUR OPINION! I believe we actually damage the cause of Jesus when we publically argue about it in anger and the Bible says that's a sin (2 Tim 2:14).
IMHO.