OK
If I say Do NOT kill another human UNLESS your very life is threatened, what does that mean in YOUR opinion?
Maybe this child me grow up to threaten me later so I'll kill them NOW
Maybe the 'problem' with, say, The Quran, other books are available ?!?!?
, is that it's not really in a language if not all but most cannot really understand. Bit like Sanskrit although both book(s) have lingual links to their more modern counterparts.
A much older volume of a different language WILL be open to alternative options & those doing the interpreting will have their own slant on things according to their own education & characters.
Maybe this will always be a problem as we're taking new views on very old written works.
We COULD discard them but much would be lost too, baby & bathwater ?!!??!
As you say about institutions but who do they REALLY represent - ie are they as neutral as they could or should be???
What agendas have they got?
As you concluded, we BOTH know total giving over to ANY older religion will not work as the mentality, attitudes & behaviours have changed dramatically since then.
We only need look at those mindless lunatics, IS, to see this.