I think if you did try claiming to a well-read and articulate Southern Baptist that Scandinavian social democrats were being more biblically accurate than Southern Baptists, they'd very quickly run verbal rings around you. And it would achieve nothing but deepening of division.
What the evangelical churches have successfully done is focus religious correctness on a few Really Important things - preventing abortion and homosexuality - while de-emphasizing many other things. You can be forgiven most things, after all Christiniaty is a forgiving religion, some things are harder to forgive than others. In that, they aren't very different from most other religions, including the numerous versions of Christianity. The things that you choose as the Really Important act as the
shibboleth of your particular tribe, and so tend to attract considerable loyalty by the people who feel they belong to that tribe. That is why they are so persistent despite generally looking completely bonkers to outsiders.
Translating the bible is often done in a way convenient for the particular dogmas of the people doing it. I like the book
Misquoting Jesus (published in UK as Whose Word Is It) by Bart Ehrman on this topic - though focusing on the New Testament. A book I frequently return to.
The original Hebrew of the 10 commandments tends to be interpreted by people who originally wrote it to mean "though shalt not murder other Jews". After all, the Old Testament god was very keen on killing people who weren't Jews, and punished the Jews when they carried out insufficient of that important religious duy. This is one of the issues that comes up quite a bit in another even better book (by my estimation, although I lent them both to a friend and he read the Ehrman twice and couldn't read this one)
The Bible Unearthed, by Israel Finkelstein and Neil Asher Silberman. Its main subject is the consistency, or otherwise, between our archaeological knowledge of Palestine and what the "historical" parts of the Old Testament say. It draws attention to some very embarrassing ex post rewriting of history that appears to have been indulged in to cover up various facts inconvenient for the National Myth. For example, that Jerusalem was a minor provincial backwater until most of the rest of Palestine was destroyed and taken over by invaders, who luckily got distracted before they got around to finishing off the final 10%.
So killing humans in general was definitely allowed, and in many cases encouraged, according to the writers of the Old Testament. And Jews can be killed too. The Old Testament prescribes the death penalty for numerous so-called
capital sins. I think perhaps you ceased to be considered a Jew if you behaved badly enough, such as striking your parents, or lying about your virginity.
Clearly this had to be reinterpreted for the purposes of Christianity, if they wanted to keep the Old Testament while rejecting Judaism. And the great diversity of Christian churches - who were once even more diverse if you read the history of the very early church, an entertaining topic the modern churches like to sweep very firmly under the carpet - is the natural consequence of the many different ways of reading this highly contradictory and vague book, containing numerous demonstrable factual errors.