For example I believe if one adheres to the old testament prohibitions against eating certain types of seafood then one will avoid most of the unsafe species in that part of the world.
Bullshit. The injunctions against certain food were based simply on the personal preference of a few people with schizotypal personalities. This video is a very engaging explanation of the connection between craziness and religion via OCD-type behavior.
Partial disproof of what you say can be found in the middens of Ancient Near Eastern people: civilizations eating pork and shellfish lived next door to Jewish civilizations that didn't, and there's no indication one thrived worse than the other.
Don't throw the "ignorant" label around unless you're prepared to be stuck with it yourself in face of evidence.