We're almost two weeks into following kosher food laws and one of our discoveries is that most of the stuff in the fridge and pantry are kosher. According to one site Jews make up only 20% of the kosher food market:
Currently, upward of 10 million people in the American market acquire approximately sixty thousand kosher products, produced by nearly ten thousand companies. Only two million of the kosher consumers are Jewish. The other eight-plus million are people who choose to eat kosher for religious (Moslems), idealistic (Vegans and Vegetarians), and health reasons.
Go here for a report on our experience with kosher food.