It is forbidden to eat their food because they have rituals like these in which the priest or the monk gives his worshippers a taste of their bread, and that’s just one example..

Seriously? These prohibitions started long before that.

That was just an example..
By the same token I could have said that they bake and sacrifice to their idols..: “Then it shall be for a person to burn, and he takes some of it and warms himself; he also kindles a fire and bakes bread. He also makes it into a god and worships it; he makes it a graven image and bows down to it. Half of it he burns in the fire; over half of it he eats meat, he roasts a roast and is satisfied; he also warms himself and says, ‘Aha, I am warm, I have seen the fire.’ And the rest of it he makes into a god, into his idol; he bows to it and worships it and prays to it and says, ‘Save me, for you are my god.’”