intra-rationalism

Postulate that humanity moved from polytheism to monotheism when they switched from uncooked to cooked cuisine.

The idea that changes to your spiritual manifestation are facilitated by changes to your diet.

Intra-rationalism is the hypothesis that belief in a single unity might have been facilitated by cooked food.

It would take the delineation of kosher food in Jewish law as indicative; but not causative of the change to monotheism.