[blowfish]

On the other hand, detailed sanitary concerns given in the Old Testament show a knowledge of biology (IE, germs) that would not fully make sense until centuries later.

Knowledge of germs? I don't think so. Knowledge of basic practical sanitation? Probably.

[js1138]

A knowledge of microrganisms as the cuse of disease leads to a different kind of sanitation than just a declaration of clean and unclean. Sanitation based on biological knowledge is much more specific in its recommendations.