What are the theists' opinions on this?
Both extremes are stupid. As is the third extreme both groups commit of making up stuff they want the bible to say to put people down.
The bible is flawed. It need not be nitpicked with a fine tooth comb. Shitheads will use it or any other excuse to justify their evil, but such is not the fault of said excuses, it comes from their all too human evil (and occasional lack of souls).
The bible likewise should not be taken literally and simultaneously declared infallible. To do so, as I pointed out in another thread, leads to comedic things like
men impregnating each other; or horrible things like God
mind controlling Pharaoh as an excuse to kill innocent children and animals (still, God must really hate frogs for some odd reason).
at the time the bible is written, those foods are unclean, which, if you eat it, will make you sick, thus live a subpar life.
Having studied biblical history at university, it's more of a happy coincidence with some foods (which yes, connects to cultural Darwinism), but utterly senseless with others. It seems to have been instigated just to have another way to apply otherness.